3952421 has 4 divisors (see below), whose sum is σ = 4311744. Its totient is φ = 3593100.

The previous prime is 3952393. The next prime is 3952423. The reversal of 3952421 is 1242593.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3952421 is a prime.

It is a super-2 number, since 2×3952421² = 31243263522482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3952423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179645 + ... + 179666.

It is an arithmetic number, because the mean of its divisors is an integer number (1077936).

Almost surely, 2^3952421 is an apocalyptic number.

It is an amenable number.

3952421 is a deficient number, since it is larger than the sum of its proper divisors (359323).

3952421 is a wasteful number, since it uses less digits than its factorization.

3952421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359322.

The product of its digits is 2160, while the sum is 26.

The square root of 3952421 is about 1988.0696667874. The cubic root of 3952421 is about 158.1082018015.

The spelling of 3952421 in words is "three million, nine hundred fifty-two thousand, four hundred twenty-one".