39899734437889 has 4 divisors (see below), whose sum is σ = 39935712558420. Its totient is φ = 39863756317360.

The previous prime is 39899734437887. The next prime is 39899734437907. The reversal of 39899734437889 is 98873443799893.

It is a happy number.

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 1617882241600 + 38281852196289 = 1271960^2 + 6187233^2 .

It is a cyclic number.

It is not a de Polignac number, because 39899734437889 - 2¹ = 39899734437887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39899734437887) 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, 17989058602 + ... + 17989060819.

It is an arithmetic number, because the mean of its divisors is an integer number (9983928139605).

Almost surely, 2^{39899734437889} is an apocalyptic number.

It is an amenable number.

39899734437889 is a deficient number, since it is larger than the sum of its proper divisors (35978120531).

39899734437889 is a wasteful number, since it uses less digits than its factorization.

39899734437889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35978120530.

The product of its digits is 71108222976, while the sum is 91.

The spelling of 39899734437889 in words is "thirty-nine trillion, eight hundred ninety-nine billion, seven hundred thirty-four million, four hundred thirty-seven thousand, eight hundred eighty-nine".