3990995 has 4 divisors (see below), whose sum is σ = 4789200. Its totient is φ = 3192792.

The previous prime is 3990979. The next prime is 3990997. The reversal of 3990995 is 5990993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5990993 = 61 ⋅98213.

It is a cyclic number.

It is not a de Polignac number, because 3990995 - 2⁴ = 3990979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3990997) 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, 399095 + ... + 399104.

It is an arithmetic number, because the mean of its divisors is an integer number (1197300).

Almost surely, 2^3990995 is an apocalyptic number.

3990995 is a deficient number, since it is larger than the sum of its proper divisors (798205).

3990995 is an equidigital number, since it uses as much as digits as its factorization.

3990995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798204.

The product of its (nonzero) digits is 98415, while the sum is 44.

The square root of 3990995 is about 1997.7474815401. The cubic root of 3990995 is about 158.6208944737.

It can be divided in two parts, 39909 and 95, that added together give a palindrome (40004).

The spelling of 3990995 in words is "three million, nine hundred ninety thousand, nine hundred ninety-five".