3921970 has 16 divisors (see below), whose sum is σ = 7602840. Its totient is φ = 1448064.

The previous prime is 3921959. The next prime is 3921971. The reversal of 3921970 is 791293.

It can be written as a sum of positive squares in 4 ways, for example, as 2601769 + 1320201 = 1613^2 + 1149^2 .

It is not an unprimeable number, because it can be changed into a prime (3921971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14955 + ... + 15214.

Almost surely, 2^3921970 is an apocalyptic number.

3921970 is a deficient number, since it is larger than the sum of its proper divisors (3680870).

3921970 is a wasteful number, since it uses less digits than its factorization.

3921970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30189.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 3921970 is about 1980.3964249614. The cubic root of 3921970 is about 157.7011120330.

The spelling of 3921970 in words is "three million, nine hundred twenty-one thousand, nine hundred seventy".