990497420 has 24 divisors (see below), whose sum is σ = 2269140048. Its totient is φ = 360180800.

The previous prime is 990497383. The next prime is 990497447. The reversal of 990497420 is 24794099.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2250911 + ... + 2251350.

It is an arithmetic number, because the mean of its divisors is an integer number (94547502).

Almost surely, 2^990497420 is an apocalyptic number.

It is an amenable number.

990497420 is an abundant number, since it is smaller than the sum of its proper divisors (1278642628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

990497420 is a wasteful number, since it uses less digits than its factorization.

990497420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4502281 (or 4502279 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 990497420 is about 31472.1689751437. The cubic root of 990497420 is about 996.8223868027.

The spelling of 990497420 in words is "nine hundred ninety million, four hundred ninety-seven thousand, four hundred twenty".