118640731 has 8 divisors (see below), whose sum is σ = 136238400. Its totient is φ = 102178440.

The previous prime is 118640713. The next prime is 118640749. The reversal of 118640731 is 137046811.

It is an interprime number because it is at equal distance from previous prime (118640713) and next prime (118640749).

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

It is a cyclic number.

It is not a de Polignac number, because 118640731 - 2¹¹ = 118638683 is a prime.

It is a super-2 number, since 2×118640731² = 28151246104428722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 118640693 and 118640702.

It is not an unprimeable number, because it can be changed into a prime (118640771) 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, 283621 + ... + 284038.

It is an arithmetic number, because the mean of its divisors is an integer number (17029800).

Almost surely, 2^118640731 is an apocalyptic number.

118640731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

118640731 is a deficient number, since it is larger than the sum of its proper divisors (17597669).

118640731 is a wasteful number, since it uses less digits than its factorization.

118640731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567689.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 118640731 is about 10892.2325994261. The cubic root of 118640731 is about 491.3729798052.

The spelling of 118640731 in words is "one hundred eighteen million, six hundred forty thousand, seven hundred thirty-one".