3970621 has 4 divisors (see below), whose sum is σ = 4029952. Its totient is φ = 3911292.

The previous prime is 3970591. The next prime is 3970633. The reversal of 3970621 is 1260793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1260793 = 509 ⋅2477.

It is a cyclic number.

It is not a de Polignac number, because 3970621 - 2⁷ = 3970493 is a prime.

It is a super-2 number, since 2×3970621² = 31531662251282, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3970621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3970691) by changing a digit.

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, 29565 + ... + 29698.

It is an arithmetic number, because the mean of its divisors is an integer number (1007488).

Almost surely, 2^3970621 is an apocalyptic number.

It is an amenable number.

3970621 is a deficient number, since it is larger than the sum of its proper divisors (59331).

3970621 is an equidigital number, since it uses as much as digits as its factorization.

3970621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59330.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 3970621 is about 1992.6417139064. The cubic root of 3970621 is about 158.3505143560.

The spelling of 3970621 in words is "three million, nine hundred seventy thousand, six hundred twenty-one".