3990115 has 4 divisors (see below), whose sum is σ = 4788144. Its totient is φ = 3192088.

The previous prime is 3990113. The next prime is 3990127. The reversal of 3990115 is 5110993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5110993 = 59 ⋅86627.

It is a cyclic number.

It is not a de Polignac number, because 3990115 - 2¹ = 3990113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3990113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399007 + ... + 399016.

It is an arithmetic number, because the mean of its divisors is an integer number (1197036).

Almost surely, 2^3990115 is an apocalyptic number.

3990115 is a deficient number, since it is larger than the sum of its proper divisors (798029).

3990115 is an equidigital number, since it uses as much as digits as its factorization.

3990115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798028.

The product of its (nonzero) digits is 1215, while the sum is 28.

The square root of 3990115 is about 1997.5272213414. The cubic root of 3990115 is about 158.6092351717.

Subtracting from 3990115 its product of nonzero digits (1215), we obtain a triangular number (3988900 = T₂₈₂₄).

The spelling of 3990115 in words is "three million, nine hundred ninety thousand, one hundred fifteen".