3902921 has 8 divisors (see below), whose sum is σ = 4276800. Its totient is φ = 3532240.

The previous prime is 3902887. The next prime is 3902929. The reversal of 3902921 is 1292093.

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

It is a cyclic number.

It is not a de Polignac number, because 3902921 - 2¹⁴ = 3886537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3902929) 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 7 ways as a sum of consecutive naturals, for example, 2300 + ... + 3618.

It is an arithmetic number, because the mean of its divisors is an integer number (534600).

Almost surely, 2^3902921 is an apocalyptic number.

It is an amenable number.

3902921 is a deficient number, since it is larger than the sum of its proper divisors (373879).

3902921 is a wasteful number, since it uses less digits than its factorization.

3902921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1599.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 3902921 is about 1975.5811803113. The cubic root of 3902921 is about 157.4453795651.

The spelling of 3902921 in words is "three million, nine hundred two thousand, nine hundred twenty-one".