39387487421 has 4 divisors (see below), whose sum is σ = 39399764700. Its totient is φ = 39375210144.

The previous prime is 39387487313. The next prime is 39387487427. The reversal of 39387487421 is 12478478393.

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 13797086521 + 25590400900 = 117461^2 + 159970^2 .

It is a cyclic number.

It is not a de Polignac number, because 39387487421 - 2²⁶ = 39320378557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39387487427) 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, 6133826 + ... + 6140243.

It is an arithmetic number, because the mean of its divisors is an integer number (9849941175).

Almost surely, 2^39387487421 is an apocalyptic number.

It is an amenable number.

39387487421 is a deficient number, since it is larger than the sum of its proper divisors (12277279).

39387487421 is a wasteful number, since it uses less digits than its factorization.

39387487421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12277278.

The product of its digits is 8128512, while the sum is 56.

The spelling of 39387487421 in words is "thirty-nine billion, three hundred eighty-seven million, four hundred eighty-seven thousand, four hundred twenty-one".