40420404 has 48 divisors (see below), whose sum is σ = 108183040. Its totient is φ = 13037760.

The previous prime is 40420381. The next prime is 40420411. The reversal of 40420404 is 40402404.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2689 + ... + 9384.

Almost surely, 2^40420404 is an apocalyptic number.

It is an amenable number.

40420404 is an abundant number, since it is smaller than the sum of its proper divisors (67762636).

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

40420404 is a wasteful number, since it uses less digits than its factorization.

40420404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12117 (or 12109 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 40420404 is about 6357.7043026552. The cubic root of 40420404 is about 343.1891507158.

Adding to 40420404 its reverse (40402404), we get a palindrome (80822808).

The spelling of 40420404 in words is "forty million, four hundred twenty thousand, four hundred four".