1397938560 has 128 divisors (see below), whose sum is σ = 4718152800. Its totient is φ = 350846976.

The previous prime is 1397938559. The next prime is 1397938561. The reversal of 1397938560 is 658397931.

It is an interprime number because it is at equal distance from previous prime (1397938559) and next prime (1397938561).

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397938561) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 11226 + ... + 54054.

Almost surely, 2^1397938560 is an apocalyptic number.

1397938560 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 1397938560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2359076400).

1397938560 is an abundant number, since it is smaller than the sum of its proper divisors (3320214240).

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

1397938560 is a wasteful number, since it uses less digits than its factorization.

1397938560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42868 (or 42856 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 51.

The square root of 1397938560 is about 37389.0165690407. The cubic root of 1397938560 is about 1118.1395985237.

The spelling of 1397938560 in words is "one billion, three hundred ninety-seven million, nine hundred thirty-eight thousand, five hundred sixty".