118400431 has 4 divisors (see below), whose sum is σ = 119621152. Its totient is φ = 117179712.

The previous prime is 118400411. The next prime is 118400467. The reversal of 118400431 is 134004811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134004811 = 10949 ⋅12239.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118400431 is a prime.

It is a super-2 number, since 2×118400431² = 28037324121971522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118400411) 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, 610215 + ... + 610408.

It is an arithmetic number, because the mean of its divisors is an integer number (29905288).

Almost surely, 2^118400431 is an apocalyptic number.

118400431 is a deficient number, since it is larger than the sum of its proper divisors (1220721).

118400431 is an equidigital number, since it uses as much as digits as its factorization.

118400431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220720.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 118400431 is about 10881.1962118142. The cubic root of 118400431 is about 491.0410063050.

The spelling of 118400431 in words is "one hundred eighteen million, four hundred thousand, four hundred thirty-one".