13397402978 has 4 divisors (see below), whose sum is σ = 20096104470. Its totient is φ = 6698701488.

The previous prime is 13397402971. The next prime is 13397403023. The reversal of 13397402978 is 87920479331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13397368009 + 34969 = 115747^2 + 187^2 .

It is not an unprimeable number, because it can be changed into a prime (13397402971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3349350743 + ... + 3349350746.

Almost surely, 2^13397402978 is an apocalyptic number.

13397402978 is a deficient number, since it is larger than the sum of its proper divisors (6698701492).

13397402978 is an equidigital number, since it uses as much as digits as its factorization.

13397402978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6698701491.

The product of its (nonzero) digits is 2286144, while the sum is 53.

The spelling of 13397402978 in words is "thirteen billion, three hundred ninety-seven million, four hundred two thousand, nine hundred seventy-eight".