3915994 has 4 divisors (see below), whose sum is σ = 5873994. Its totient is φ = 1957996.

The previous prime is 3915979. The next prime is 3915997. The reversal of 3915994 is 4995193.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4995193 = 7 ⋅713599.

It can be written as a sum of positive squares in only one way, i.e., 3751969 + 164025 = 1937^2 + 405^2 .

It is not an unprimeable number, because it can be changed into a prime (3915997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 978997 + ... + 979000.

Almost surely, 2^3915994 is an apocalyptic number.

3915994 is a deficient number, since it is larger than the sum of its proper divisors (1958000).

3915994 is a wasteful number, since it uses less digits than its factorization.

3915994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1957999.

The product of its digits is 43740, while the sum is 40.

The square root of 3915994 is about 1978.8870609512. The cubic root of 3915994 is about 157.6209736574.

The spelling of 3915994 in words is "three million, nine hundred fifteen thousand, nine hundred ninety-four".