3975621 has 8 divisors (see below), whose sum is σ = 5708640. Its totient is φ = 2446512.

The previous prime is 3975599. The next prime is 3975649. The reversal of 3975621 is 1265793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3975621 - 2⁷ = 3975493 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3975661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50931 + ... + 51008.

It is an arithmetic number, because the mean of its divisors is an integer number (713580).

Almost surely, 2^3975621 is an apocalyptic number.

It is an amenable number.

3975621 is a deficient number, since it is larger than the sum of its proper divisors (1733019).

3975621 is a wasteful number, since it uses less digits than its factorization.

3975621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101955.

The product of its digits is 11340, while the sum is 33.

The square root of 3975621 is about 1993.8959350979. The cubic root of 3975621 is about 158.4169540444.

The spelling of 3975621 in words is "three million, nine hundred seventy-five thousand, six hundred twenty-one".