39987684261 has 48 divisors (see below), whose sum is σ = 68944409280. Its totient is φ = 22839697440.

The previous prime is 39987684197. The next prime is 39987684313. The reversal of 39987684261 is 16248678993.

It is not a de Polignac number, because 39987684261 - 2⁶ = 39987684197 is a prime.

It is a super-2 number, since 2×39987684261² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39987684761) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3620830 + ... + 3631856.

It is an arithmetic number, because the mean of its divisors is an integer number (1436341860).

Almost surely, 2^39987684261 is an apocalyptic number.

It is an amenable number.

39987684261 is a deficient number, since it is larger than the sum of its proper divisors (28956725019).

39987684261 is a wasteful number, since it uses less digits than its factorization.

39987684261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13791 (or 13778 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 63.

The spelling of 39987684261 in words is "thirty-nine billion, nine hundred eighty-seven million, six hundred eighty-four thousand, two hundred sixty-one".