918449731 has 8 divisors (see below), whose sum is σ = 961848864. Its totient is φ = 875339520.

The previous prime is 918449729. The next prime is 918449737. The reversal of 918449731 is 137944819.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 918449731 - 2¹ = 918449729 is a prime.

It is a super-2 number, since 2×918449731² = 1687099816747944722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (918449737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65710 + ... + 78451.

It is an arithmetic number, because the mean of its divisors is an integer number (120231108).

Almost surely, 2^918449731 is an apocalyptic number.

918449731 is a deficient number, since it is larger than the sum of its proper divisors (43399133).

918449731 is a wasteful number, since it uses less digits than its factorization.

918449731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144461.

The product of its digits is 217728, while the sum is 46.

The square root of 918449731 is about 30305.9355737453. The cubic root of 918449731 is about 972.0422240431.

The spelling of 918449731 in words is "nine hundred eighteen million, four hundred forty-nine thousand, seven hundred thirty-one".