3999375 has 50 divisors (see below), whose sum is σ = 7560080. Its totient is φ = 2106000.

The previous prime is 3999337. The next prime is 3999379. The reversal of 3999375 is 5739993.

It is not a de Polignac number, because 3999375 - 2⁶ = 3999311 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 3999375.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999379) by changing a digit.

It is a polite number, since it can be written in 49 ways as a sum of consecutive naturals, for example, 50586 + ... + 50664.

Almost surely, 2^3999375 is an apocalyptic number.

3999375 is a deficient number, since it is larger than the sum of its proper divisors (3560705).

3999375 is an frugal number, since it uses more digits than its factorization.

3999375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111 (or 87 counting only the distinct ones).

The product of its digits is 229635, while the sum is 45.

The square root of 3999375 is about 1999.8437438960. The cubic root of 3999375 is about 158.7318370524.

The spelling of 3999375 in words is "three million, nine hundred ninety-nine thousand, three hundred seventy-five".