1398243440 has 160 divisors (see below), whose sum is σ = 3759402240. Its totient is φ = 478310400.

The previous prime is 1398243401. The next prime is 1398243461. The reversal of 1398243440 is 443428931.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 1398243394 and 1398243403.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4029347 + ... + 4029693.

It is an arithmetic number, because the mean of its divisors is an integer number (23496264).

Almost surely, 2^1398243440 is an apocalyptic number.

1398243440 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 1398243440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1879701120).

1398243440 is an abundant number, since it is smaller than the sum of its proper divisors (2361158800).

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

1398243440 is a wasteful number, since it uses less digits than its factorization.

1398243440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631 (or 625 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 1398243440 is about 37393.0934799463. The cubic root of 1398243440 is about 1118.2208785911.

The spelling of 1398243440 in words is "one billion, three hundred ninety-eight million, two hundred forty-three thousand, four hundred forty".