3907421 has 4 divisors (see below), whose sum is σ = 4465632. Its totient is φ = 3349212.

The previous prime is 3907417. The next prime is 3907441. The reversal of 3907421 is 1247093.

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: 1247093 = 179 ⋅6967.

It is a cyclic number.

It is not a de Polignac number, because 3907421 - 2² = 3907417 is a prime.

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 (3907441) 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, 279095 + ... + 279108.

It is an arithmetic number, because the mean of its divisors is an integer number (1116408).

Almost surely, 2^3907421 is an apocalyptic number.

It is an amenable number.

3907421 is a deficient number, since it is larger than the sum of its proper divisors (558211).

3907421 is an equidigital number, since it uses as much as digits as its factorization.

3907421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558210.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 3907421 is about 1976.7197575782. The cubic root of 3907421 is about 157.5058669184.

The spelling of 3907421 in words is "three million, nine hundred seven thousand, four hundred twenty-one".