90400406 has 4 divisors (see below), whose sum is σ = 135600612. Its totient is φ = 45200202.

The previous prime is 90400399. The next prime is 90400417. The reversal of 90400406 is 60400409.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22600100 + ... + 22600103.

It is an arithmetic number, because the mean of its divisors is an integer number (33900153).

Almost surely, 2^90400406 is an apocalyptic number.

90400406 is a deficient number, since it is larger than the sum of its proper divisors (45200206).

90400406 is a wasteful number, since it uses less digits than its factorization.

90400406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45200205.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 90400406 is about 9507.9128098653. The cubic root of 90400406 is about 448.8040771986.

The spelling of 90400406 in words is "ninety million, four hundred thousand, four hundred six".