3938640 has 40 divisors (see below), whose sum is σ = 12210528. Its totient is φ = 1050240.

The previous prime is 3938639. The next prime is 3938653. The reversal of 3938640 is 468393.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7966 + ... + 8445.

Almost surely, 2^3938640 is an apocalyptic number.

3938640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3938640 is an abundant number, since it is smaller than the sum of its proper divisors (8271888).

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

3938640 is a wasteful number, since it uses less digits than its factorization.

3938640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16427 (or 16421 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 3938640 is about 1984.6007155093. The cubic root of 3938640 is about 157.9242279417.

The spelling of 3938640 in words is "three million, nine hundred thirty-eight thousand, six hundred forty".