3915999 has 8 divisors (see below), whose sum is σ = 5801520. Its totient is φ = 2610648.

The previous prime is 3915997. The next prime is 3916019. The reversal of 3915999 is 9995193.

It is not a de Polignac number, because 3915999 - 2¹ = 3915997 is a prime.

3915999 is a lucky number.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 72492 + ... + 72545.

It is an arithmetic number, because the mean of its divisors is an integer number (725190).

Almost surely, 2^3915999 is an apocalyptic number.

3915999 is a deficient number, since it is larger than the sum of its proper divisors (1885521).

3915999 is a wasteful number, since it uses less digits than its factorization.

3915999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145046 (or 145040 counting only the distinct ones).

The product of its digits is 98415, while the sum is 45.

The square root of 3915999 is about 1978.8883242871. Note that the first 3 decimals coincide. The cubic root of 3915999 is about 157.6210407417.

The spelling of 3915999 in words is "three million, nine hundred fifteen thousand, nine hundred ninety-nine".