39861399 has 16 divisors (see below), whose sum is σ = 55209600. Its totient is φ = 25551456.

The previous prime is 39861361. The next prime is 39861401. The reversal of 39861399 is 99316893.

It is a happy number.

It is not a de Polignac number, because 39861399 - 2⁷ = 39861271 is a prime.

It is a super-2 number, since 2×39861399² = 3177862260474402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39861329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23812 + ... + 25430.

It is an arithmetic number, because the mean of its divisors is an integer number (3450600).

Almost surely, 2^39861399 is an apocalyptic number.

39861399 is a deficient number, since it is larger than the sum of its proper divisors (15348201).

39861399 is a wasteful number, since it uses less digits than its factorization.

39861399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1934.

The product of its digits is 314928, while the sum is 48.

The square root of 39861399 is about 6313.5884408156. The cubic root of 39861399 is about 341.5997249247.

The spelling of 39861399 in words is "thirty-nine million, eight hundred sixty-one thousand, three hundred ninety-nine".