3909402981 has 32 divisors (see below), whose sum is σ = 6326812800. Its totient is φ = 2366115840.

The previous prime is 3909402967. The next prime is 3909402997. The reversal of 3909402981 is 1892049093.

It is not a de Polignac number, because 3909402981 - 2²⁵ = 3875848549 is a prime.

It is a super-2 number, since 2×3909402981² = 30566863335703372722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3909402181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 219835 + ... + 236951.

It is an arithmetic number, because the mean of its divisors is an integer number (197712900).

Almost surely, 2^3909402981 is an apocalyptic number.

It is an amenable number.

3909402981 is a deficient number, since it is larger than the sum of its proper divisors (2417409819).

3909402981 is a wasteful number, since it uses less digits than its factorization.

3909402981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17906 (or 17900 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 3909402981 is about 62525.2187601131. The cubic root of 3909402981 is about 1575.3249325062.

The spelling of 3909402981 in words is "three billion, nine hundred nine million, four hundred two thousand, nine hundred eighty-one".