999493731 has 12 divisors (see below), whose sum is σ = 1447807608. Its totient is φ = 664439424.

The previous prime is 999493721. The next prime is 999493751. The reversal of 999493731 is 137394999.

It is not a de Polignac number, because 999493731 - 2²² = 995299427 is a prime.

It is a super-2 number, since 2×999493731² = 1997975436616600722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (999493711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154125 + ... + 160478.

It is an arithmetic number, because the mean of its divisors is an integer number (120650634).

Almost surely, 2^999493731 is an apocalyptic number.

999493731 is a deficient number, since it is larger than the sum of its proper divisors (448313877).

999493731 is a wasteful number, since it uses less digits than its factorization.

999493731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314962 (or 314959 counting only the distinct ones).

The product of its digits is 1653372, while the sum is 54.

The square root of 999493731 is about 31614.7707725361. The cubic root of 999493731 is about 999.8312151800.

The spelling of 999493731 in words is "nine hundred ninety-nine million, four hundred ninety-three thousand, seven hundred thirty-one".