1398422040 has 256 divisors, whose sum is σ = 4732992000. Its totient is φ = 328458240.

The previous prime is 1398422027. The next prime is 1398422041. The reversal of 1398422040 is 402248931.

It is a junction number, because it is equal to n+sod(n) for n = 1398421992 and 1398422010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398422041) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4224675 + ... + 4225005.

It is an arithmetic number, because the mean of its divisors is an integer number (18488250).

Almost surely, 2^1398422040 is an apocalyptic number.

1398422040 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 1398422040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2366496000).

1398422040 is an abundant number, since it is smaller than the sum of its proper divisors (3334569960).

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

1398422040 is a wasteful number, since it uses less digits than its factorization.

1398422040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490 (or 486 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 1398422040 is about 37395.4815452348. The cubic root of 1398422040 is about 1118.2684873123.

The spelling of 1398422040 in words is "one billion, three hundred ninety-eight million, four hundred twenty-two thousand, forty".