1397839536 has 120 divisors (see below), whose sum is σ = 4094737920. Its totient is φ = 444309888.

The previous prime is 1397839529. The next prime is 1397839537. The reversal of 1397839536 is 6359387931.

1397839536 is a `hidden beast` number, since 1 + 3 + 9 + 78 + 39 + 536 = 666.

It is not an unprimeable number, because it can be changed into a prime (1397839537) 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, 1943785 + ... + 1944503.

It is an arithmetic number, because the mean of its divisors is an integer number (34122816).

Almost surely, 2^1397839536 is an apocalyptic number.

1397839536 is a gapful number since it is divisible by the number (16) 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 1397839536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2047368960).

1397839536 is an abundant number, since it is smaller than the sum of its proper divisors (2696898384).

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

1397839536 is a wasteful number, since it uses less digits than its factorization.

1397839536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343 (or 1334 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 54.

The square root of 1397839536 is about 37387.6923064262. The cubic root of 1397839536 is about 1118.1131964883.

The spelling of 1397839536 in words is "one billion, three hundred ninety-seven million, eight hundred thirty-nine thousand, five hundred thirty-six".