40000004 has 12 divisors (see below), whose sum is σ = 76363728. Its totient is φ = 18181800.

The previous prime is 40000003. The next prime is 40000021.

It is a happy number.

40000004 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 39999946 and 40000000.

It is not an unprimeable number, because it can be changed into a prime (40000003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454502 + ... + 454589.

It is an arithmetic number, because the mean of its divisors is an integer number (6363644).

Almost surely, 2^40000004 is an apocalyptic number.

40000004 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

40000004 is a deficient number, since it is larger than the sum of its proper divisors (36363724).

40000004 is a wasteful number, since it uses less digits than its factorization.

40000004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909106 (or 909104 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 8.

The square root of 40000004 is about 6324.5556365645. Note that the first 3 decimals coincide. The cubic root of 40000004 is about 341.9952007352.

It can be divided in two parts, 4000000 and 4, that multiplied together give a square (16000000 = 4000²).

The spelling of 40000004 in words is "forty million, four", and thus it is an aban number and an eban number.