39999869 has 8 divisors (see below), whose sum is σ = 49230720. Its totient is φ = 31648176.

The previous prime is 39999863. The next prime is 39999899. The reversal of 39999869 is 96899993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 39999869 - 2¹² = 39995773 is a prime.

It is a super-2 number, since 2×39999869² = 3199979040034322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39999863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219689 + ... + 219870.

It is an arithmetic number, because the mean of its divisors is an integer number (6153840).

Almost surely, 2^39999869 is an apocalyptic number.

It is an amenable number.

39999869 is a deficient number, since it is larger than the sum of its proper divisors (9230851).

39999869 is a wasteful number, since it uses less digits than its factorization.

39999869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439579.

The product of its digits is 8503056, while the sum is 62.

The square root of 39999869 is about 6324.5449638689. The cubic root of 39999869 is about 341.9948159902.

The spelling of 39999869 in words is "thirty-nine million, nine hundred ninety-nine thousand, eight hundred sixty-nine".