918138757 has 4 divisors (see below), whose sum is σ = 942953356. Its totient is φ = 893324160.

The previous prime is 918138743. The next prime is 918138761. The reversal of 918138757 is 757831819.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 757831819 = 1277 ⋅593447.

It can be written as a sum of positive squares in 2 ways, for example, as 885717121 + 32421636 = 29761^2 + 5694^2 .

It is a cyclic number.

It is not a de Polignac number, because 918138757 - 2⁷ = 918138629 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 918138757.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (918138797) 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, 12407244 + ... + 12407317.

It is an arithmetic number, because the mean of its divisors is an integer number (235738339).

Almost surely, 2^918138757 is an apocalyptic number.

It is an amenable number.

918138757 is a deficient number, since it is larger than the sum of its proper divisors (24814599).

918138757 is a wasteful number, since it uses less digits than its factorization.

918138757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24814598.

The product of its digits is 423360, while the sum is 49.

The square root of 918138757 is about 30300.8045602753. The cubic root of 918138757 is about 971.9325051074.

The spelling of 918138757 in words is "nine hundred eighteen million, one hundred thirty-eight thousand, seven hundred fifty-seven".