39877969 has 4 divisors (see below), whose sum is σ = 39897396. Its totient is φ = 39858544.

The previous prime is 39877951. The next prime is 39877973. The reversal of 39877969 is 96977893.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17740944 + 22137025 = 4212^2 + 4705^2 .

It is a cyclic number.

It is not a de Polignac number, because 39877969 - 2⁹ = 39877457 is a prime.

It is a super-2 number, since 2×39877969² = 3180504823129922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39877939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6214 + ... + 10879.

It is an arithmetic number, because the mean of its divisors is an integer number (9974349).

Almost surely, 2^39877969 is an apocalyptic number.

It is an amenable number.

39877969 is a deficient number, since it is larger than the sum of its proper divisors (19427).

39877969 is a wasteful number, since it uses less digits than its factorization.

39877969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19426.

The product of its digits is 5143824, while the sum is 58.

The square root of 39877969 is about 6314.9005534529. The cubic root of 39877969 is about 341.6470516071.

The spelling of 39877969 in words is "thirty-nine million, eight hundred seventy-seven thousand, nine hundred sixty-nine".