40390404 has 12 divisors (see below), whose sum is σ = 94244304. Its totient is φ = 13463464.

The previous prime is 40390393. The next prime is 40390411. The reversal of 40390404 is 40409304.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1682922 + ... + 1682945.

It is an arithmetic number, because the mean of its divisors is an integer number (7853692).

Almost surely, 2^40390404 is an apocalyptic number.

It is an amenable number.

40390404 is an abundant number, since it is smaller than the sum of its proper divisors (53853900).

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

40390404 is a wasteful number, since it uses less digits than its factorization.

40390404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3365874 (or 3365872 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 40390404 is about 6355.3445225259. The cubic root of 40390404 is about 343.1042247732.

Adding to 40390404 its reverse (40409304), we get a palindrome (80799708).

The spelling of 40390404 in words is "forty million, three hundred ninety thousand, four hundred four".