4000399 has 6 divisors (see below), whose sum is σ = 4331976. Its totient is φ = 3692520.

The previous prime is 4000379. The next prime is 4000439. The reversal of 4000399 is 9930004.

It is not a de Polignac number, because 4000399 - 2¹³ = 3992207 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000309) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11667 + ... + 12004.

It is an arithmetic number, because the mean of its divisors is an integer number (721996).

Almost surely, 2^4000399 is an apocalyptic number.

4000399 is a deficient number, since it is larger than the sum of its proper divisors (331577).

4000399 is a wasteful number, since it uses less digits than its factorization.

4000399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23697 (or 23684 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 4000399 is about 2000.0997475126. The cubic root of 4000399 is about 158.7453831298.

The spelling of 4000399 in words is "four million, three hundred ninety-nine", and thus it is an aban number.