3940400785 has 16 divisors (see below), whose sum is σ = 4990190400. Its totient is φ = 2978703936.

The previous prime is 3940400771. The next prime is 3940400809. The reversal of 3940400785 is 5870040493.

It is a cyclic number.

It is not a de Polignac number, because 3940400785 - 2⁷ = 3940400657 is a prime.

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, 16359 + ... + 90268.

It is an arithmetic number, because the mean of its divisors is an integer number (311886900).

Almost surely, 2^3940400785 is an apocalyptic number.

It is an amenable number.

3940400785 is a deficient number, since it is larger than the sum of its proper divisors (1049789615).

3940400785 is a wasteful number, since it uses less digits than its factorization.

3940400785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107040.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 3940400785 is about 62772.6117427019. The cubic root of 3940400785 is about 1579.4775799136.

The spelling of 3940400785 in words is "three billion, nine hundred forty million, four hundred thousand, seven hundred eighty-five".