991210402 has 32 divisors (see below), whose sum is σ = 1852002432. Its totient is φ = 387396864.

The previous prime is 991210387. The next prime is 991210433. The reversal of 991210402 is 204012199.

It is a happy number.

991210402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×991210402² = 1964996122066003208, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17703 + ... + 47914.

It is an arithmetic number, because the mean of its divisors is an integer number (57875076).

Almost surely, 2^991210402 is an apocalyptic number.

991210402 is a deficient number, since it is larger than the sum of its proper divisors (860792030).

991210402 is a wasteful number, since it uses less digits than its factorization.

991210402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65722.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 991210402 is about 31483.4941199353. The cubic root of 991210402 is about 997.0615077208.

The spelling of 991210402 in words is "nine hundred ninety-one million, two hundred ten thousand, four hundred two".