3929421 has 4 divisors (see below), whose sum is σ = 5239232. Its totient is φ = 2619612.

The previous prime is 3929417. The next prime is 3929449. The reversal of 3929421 is 1249293.

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 not a de Polignac number, because 3929421 - 2² = 3929417 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3929461) 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, 654901 + ... + 654906.

It is an arithmetic number, because the mean of its divisors is an integer number (1309808).

Almost surely, 2^3929421 is an apocalyptic number.

It is an amenable number.

3929421 is a deficient number, since it is larger than the sum of its proper divisors (1309811).

3929421 is a wasteful number, since it uses less digits than its factorization.

3929421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309810.

The product of its digits is 3888, while the sum is 30.

The square root of 3929421 is about 1982.2767213485. The cubic root of 3929421 is about 157.8009162690.

The spelling of 3929421 in words is "three million, nine hundred twenty-nine thousand, four hundred twenty-one".