787972639 has 2 divisors, whose sum is σ = 787972640. Its totient is φ = 787972638.

The previous prime is 787972637. The next prime is 787972673. The reversal of 787972639 is 936279787.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 787972639 - 2¹ = 787972637 is a prime.

Together with 787972637, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (787972631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 393986319 + 393986320.

It is an arithmetic number, because the mean of its divisors is an integer number (393986320).

Almost surely, 2^787972639 is an apocalyptic number.

787972639 is a deficient number, since it is larger than the sum of its proper divisors (1).

787972639 is an equidigital number, since it uses as much as digits as its factorization.

787972639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8001504, while the sum is 58.

The square root of 787972639 is about 28070.8503433722. The cubic root of 787972639 is about 923.6420840838.

The spelling of 787972639 in words is "seven hundred eighty-seven million, nine hundred seventy-two thousand, six hundred thirty-nine".