990253603 has 4 divisors (see below), whose sum is σ = 993059208. Its totient is φ = 987448000.

The previous prime is 990253567. The next prime is 990253613. The reversal of 990253603 is 306352099.

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

It is a cyclic number.

It is not a de Polignac number, because 990253603 - 2¹⁷ = 990122531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990253613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1402273 + ... + 1402978.

It is an arithmetic number, because the mean of its divisors is an integer number (248264802).

Almost surely, 2^990253603 is an apocalyptic number.

990253603 is a deficient number, since it is larger than the sum of its proper divisors (2805605).

990253603 is a wasteful number, since it uses less digits than its factorization.

990253603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2805604.

The product of its (nonzero) digits is 43740, while the sum is 37.

The square root of 990253603 is about 31468.2952032677. The cubic root of 990253603 is about 996.7405887809.

The spelling of 990253603 in words is "nine hundred ninety million, two hundred fifty-three thousand, six hundred three".