40003428 has 12 divisors (see below), whose sum is σ = 93341360. Its totient is φ = 13334472.

The previous prime is 40003409. The next prime is 40003451. The reversal of 40003428 is 82430004.

It is a happy number.

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, 1666798 + ... + 1666821.

Almost surely, 2^40003428 is an apocalyptic number.

It is an amenable number.

40003428 is an abundant number, since it is smaller than the sum of its proper divisors (53337932).

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

40003428 is a wasteful number, since it uses less digits than its factorization.

40003428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333626 (or 3333624 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 40003428 is about 6324.8263217262. The cubic root of 40003428 is about 342.0049587188.

The spelling of 40003428 in words is "forty million, three thousand, four hundred twenty-eight".