978629402 has 4 divisors (see below), whose sum is σ = 1467944106. Its totient is φ = 489314700.

The previous prime is 978629387. The next prime is 978629413. The reversal of 978629402 is 204926879.

978629402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 701773081 + 276856321 = 26491^2 + 16639^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244657349 + ... + 244657352.

Almost surely, 2^978629402 is an apocalyptic number.

978629402 is a deficient number, since it is larger than the sum of its proper divisors (489314704).

978629402 is a wasteful number, since it uses less digits than its factorization.

978629402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489314703.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 978629402 is about 31283.0529520378. The cubic root of 978629402 is about 992.8251114260.

The spelling of 978629402 in words is "nine hundred seventy-eight million, six hundred twenty-nine thousand, four hundred two".