118308421 has 32 divisors (see below), whose sum is σ = 156441600. Its totient is φ = 86676480.

The previous prime is 118308403. The next prime is 118308427. The reversal of 118308421 is 124803811.

It is not a de Polignac number, because 118308421 - 2²³ = 109919813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 118308421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118308427) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 282150 + ... + 282568.

It is an arithmetic number, because the mean of its divisors is an integer number (4888800).

Almost surely, 2^118308421 is an apocalyptic number.

118308421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

118308421 is a deficient number, since it is larger than the sum of its proper divisors (38133179).

118308421 is a wasteful number, since it uses less digits than its factorization.

118308421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 118308421 is about 10876.9674542126. The cubic root of 118308421 is about 490.9137759363.

The spelling of 118308421 in words is "one hundred eighteen million, three hundred eight thousand, four hundred twenty-one".