3921290 has 16 divisors (see below), whose sum is σ = 7086312. Its totient is φ = 1562304.

The previous prime is 3921289. The next prime is 3921301. The reversal of 3921290 is 921293.

It can be written as a sum of positive squares in 4 ways, for example, as 2660161 + 1261129 = 1631^2 + 1123^2 .

It is an unprimeable number.

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, 2552 + ... + 3788.

Almost surely, 2^3921290 is an apocalyptic number.

3921290 is a deficient number, since it is larger than the sum of its proper divisors (3165022).

3921290 is a wasteful number, since it uses less digits than its factorization.

3921290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561.

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

The square root of 3921290 is about 1980.2247347208. The cubic root of 3921290 is about 157.6919973148.

The spelling of 3921290 in words is "three million, nine hundred twenty-one thousand, two hundred ninety".