1398898440 has 96 divisors (see below), whose sum is σ = 4597608600. Its totient is φ = 368839680.

The previous prime is 1398898439. The next prime is 1398898441. The reversal of 1398898440 is 448988931.

1398898440 is a `hidden beast` number, since 1 + 39 + 88 + 98 + 440 = 666.

It is an interprime number because it is at equal distance from previous prime (1398898439) and next prime (1398898441).

It can be written as a sum of positive squares in 4 ways, for example, as 1181571876 + 217326564 = 34374^2 + 14742^2 .

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1398898441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10210 + ... + 53870.

Almost surely, 2^1398898440 is an apocalyptic number.

1398898440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1398898440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2298804300).

1398898440 is an abundant number, since it is smaller than the sum of its proper divisors (3198710160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1398898440 is a wasteful number, since it uses less digits than its factorization.

1398898440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43767 (or 43760 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 54.

The square root of 1398898440 is about 37401.8507563463. The cubic root of 1398898440 is about 1118.3954596204.

The spelling of 1398898440 in words is "one billion, three hundred ninety-eight million, eight hundred ninety-eight thousand, four hundred forty".