1397606688 has 72 divisors (see below), whose sum is σ = 4071416076. Its totient is φ = 454502400.

The previous prime is 1397606687. The next prime is 1397606689. The reversal of 1397606688 is 8866067931.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1397606687) and next prime (1397606689).

It can be written as a sum of positive squares in 2 ways, for example, as 1384732944 + 12873744 = 37212^2 + 3588^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (1397606687) 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 11 ways as a sum of consecutive naturals, for example, 47373 + ... + 70988.

Almost surely, 2^1397606688 is an apocalyptic number.

1397606688 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1397606688 is an abundant number, since it is smaller than the sum of its proper divisors (2673809388).

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

1397606688 is a wasteful number, since it uses less digits than its factorization.

1397606688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118418 (or 118407 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The square root of 1397606688 is about 37384.5782108077. The cubic root of 1397606688 is about 1118.0511090378.

The spelling of 1397606688 in words is "one billion, three hundred ninety-seven million, six hundred six thousand, six hundred eighty-eight".