874747639 has 2 divisors, whose sum is σ = 874747640. Its totient is φ = 874747638.

The previous prime is 874747633. The next prime is 874747693. The reversal of 874747639 is 936747478.

Together with next prime (874747693) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 874747639 - 2²³ = 866359031 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 874747639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (874747633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 437373819 + 437373820.

It is an arithmetic number, because the mean of its divisors is an integer number (437373820).

Almost surely, 2^874747639 is an apocalyptic number.

874747639 is a deficient number, since it is larger than the sum of its proper divisors (1).

874747639 is an equidigital number, since it uses as much as digits as its factorization.

874747639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7112448, while the sum is 55.

The square root of 874747639 is about 29576.1329284273. The cubic root of 874747639 is about 956.3736303112.

The spelling of 874747639 in words is "eight hundred seventy-four million, seven hundred forty-seven thousand, six hundred thirty-nine".