3922640 has 20 divisors (see below), whose sum is σ = 9120324. Its totient is φ = 1569024.

The previous prime is 3922637. The next prime is 3922651. The reversal of 3922640 is 462293.

3922640 = T₄₇ + T₄₈ + ... + T₂₈₆.

It can be written as a sum of positive squares in 2 ways, for example, as 1073296 + 2849344 = 1036^2 + 1688^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 24437 + ... + 24596.

Almost surely, 2^3922640 is an apocalyptic number.

It is an amenable number.

3922640 is an abundant number, since it is smaller than the sum of its proper divisors (5197684).

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

3922640 is a wasteful number, since it uses less digits than its factorization.

3922640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49046 (or 49040 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 3922640 is about 1980.5655757889. The cubic root of 3922640 is about 157.7100916809.

The spelling of 3922640 in words is "three million, nine hundred twenty-two thousand, six hundred forty".