409523990 has 16 divisors (see below), whose sum is σ = 755123040. Its totient is φ = 159814080.

The previous prime is 409523957. The next prime is 409524001. The reversal of 409523990 is 99325904.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

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, 499010 + ... + 499829.

It is an arithmetic number, because the mean of its divisors is an integer number (47195190).

Almost surely, 2^409523990 is an apocalyptic number.

409523990 is a deficient number, since it is larger than the sum of its proper divisors (345599050).

409523990 is a wasteful number, since it uses less digits than its factorization.

409523990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998887.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 409523990 is about 20236.6990885371. The cubic root of 409523990 is about 742.6082721029.

The spelling of 409523990 in words is "four hundred nine million, five hundred twenty-three thousand, nine hundred ninety".