39899969 has 8 divisors (see below), whose sum is σ = 43704360. Its totient is φ = 36257536.

The previous prime is 39899957. The next prime is 39899999. The reversal of 39899969 is 96999893.

It can be written as a sum of positive squares in 4 ways, for example, as 9241600 + 30658369 = 3040^2 + 5537^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 39899969 - 2⁴ = 39899953 is a prime.

It is a super-2 number, since 2×39899969² = 3184015052401922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39899939) 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, 39974 + ... + 40959.

It is an arithmetic number, because the mean of its divisors is an integer number (5463045).

Almost surely, 2^39899969 is an apocalyptic number.

It is an amenable number.

39899969 is a deficient number, since it is larger than the sum of its proper divisors (3804391).

39899969 is a wasteful number, since it uses less digits than its factorization.

39899969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80979.

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

The square root of 39899969 is about 6316.6422251066. The cubic root of 39899969 is about 341.7098670208.

The spelling of 39899969 in words is "thirty-nine million, eight hundred ninety-nine thousand, nine hundred sixty-nine".