1990790902 has 4 divisors (see below), whose sum is σ = 2986186356. Its totient is φ = 995395450.

The previous prime is 1990790833. The next prime is 1990790903. The reversal of 1990790902 is 2090970991.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990790903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497697724 + ... + 497697727.

It is an arithmetic number, because the mean of its divisors is an integer number (746546589).

Almost surely, 2^1990790902 is an apocalyptic number.

1990790902 is a deficient number, since it is larger than the sum of its proper divisors (995395454).

1990790902 is an equidigital number, since it uses as much as digits as its factorization.

1990790902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995395453.

The product of its (nonzero) digits is 91854, while the sum is 46.

The square root of 1990790902 is about 44618.2799085756. The cubic root of 1990790902 is about 1257.9842847994.

The spelling of 1990790902 in words is "one billion, nine hundred ninety million, seven hundred ninety thousand, nine hundred two".