1397340288 has 64 divisors (see below), whose sum is σ = 4124104800. Its totient is φ = 465778944.

The previous prime is 1397340277. The next prime is 1397340319. The reversal of 1397340288 is 8820437931.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198706 + ... + 205617.

Almost surely, 2^1397340288 is an apocalyptic number.

1397340288 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1397340288 is an abundant number, since it is smaller than the sum of its proper divisors (2726764512).

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

1397340288 is an equidigital number, since it uses as much as digits as its factorization.

1397340288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404346 (or 404328 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 1397340288 is about 37381.0150745001. The cubic root of 1397340288 is about 1117.9800666993.

The spelling of 1397340288 in words is "one billion, three hundred ninety-seven million, three hundred forty thousand, two hundred eighty-eight".