39987213409 has 16 divisors (see below), whose sum is σ = 47007132480. Its totient is φ = 33534884160.

The previous prime is 39987213407. The next prime is 39987213443. The reversal of 39987213409 is 90431278993.

39987213409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 39987213409 - 2¹ = 39987213407 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39987213409.

It is not an unprimeable number, because it can be changed into a prime (39987213407) 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, 146727 + ... + 318595.

It is an arithmetic number, because the mean of its divisors is an integer number (2937945780).

Almost surely, 2^39987213409 is an apocalyptic number.

It is an amenable number.

39987213409 is a deficient number, since it is larger than the sum of its proper divisors (7019919071).

39987213409 is a wasteful number, since it uses less digits than its factorization.

39987213409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173520.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The spelling of 39987213409 in words is "thirty-nine billion, nine hundred eighty-seven million, two hundred thirteen thousand, four hundred nine".