74787389 has 2 divisors, whose sum is σ = 74787390. Its totient is φ = 74787388.

The previous prime is 74787367. The next prime is 74787409. The reversal of 74787389 is 98378747.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55383364 + 19404025 = 7442^2 + 4405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74787389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 74787389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74787319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37393694 + 37393695.

It is an arithmetic number, because the mean of its divisors is an integer number (37393695).

Almost surely, 2^74787389 is an apocalyptic number.

It is an amenable number.

74787389 is a deficient number, since it is larger than the sum of its proper divisors (1).

74787389 is an equidigital number, since it uses as much as digits as its factorization.

74787389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2370816, while the sum is 53.

The square root of 74787389 is about 8647.9702242781. The cubic root of 74787389 is about 421.3174598089.

It can be divided in two parts, 7478738 and 9, that added together give a palindrome (7478747).

The spelling of 74787389 in words is "seventy-four million, seven hundred eighty-seven thousand, three hundred eighty-nine".