3940040421 has 32 divisors (see below), whose sum is σ = 6006528000. Its totient is φ = 2551140144.

The previous prime is 3940040389. The next prime is 3940040459. The reversal of 3940040421 is 1240400493.

It is not a de Polignac number, because 3940040421 - 2⁵ = 3940040389 is a prime.

It is a super-2 number, since 2×3940040421² = 31047837038227714482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3940020421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 198340 + ... + 217298.

It is an arithmetic number, because the mean of its divisors is an integer number (187704000).

Almost surely, 2^3940040421 is an apocalyptic number.

It is an amenable number.

3940040421 is a deficient number, since it is larger than the sum of its proper divisors (2066487579).

3940040421 is a wasteful number, since it uses less digits than its factorization.

3940040421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19190 (or 19184 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 3940040421 is about 62769.7412851128. The cubic root of 3940040421 is about 1579.4294287870.

The spelling of 3940040421 in words is "three billion, nine hundred forty million, forty thousand, four hundred twenty-one".