118138428 has 36 divisors (see below), whose sum is σ = 314346760. Its totient is φ = 37306656.

The previous prime is 118138411. The next prime is 118138429. The reversal of 118138428 is 824831811.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×118138428² = 27913376340622368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 118138392 and 118138401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118138429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85675 + ... + 87042.

Almost surely, 2^118138428 is an apocalyptic number.

118138428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

118138428 is an abundant number, since it is smaller than the sum of its proper divisors (196208332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

118138428 is a wasteful number, since it uses less digits than its factorization.

118138428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172746 (or 172741 counting only the distinct ones).

The product of its digits is 12288, while the sum is 36.

The square root of 118138428 is about 10869.1502887760. The cubic root of 118138428 is about 490.6785379417.

The spelling of 118138428 in words is "one hundred eighteen million, one hundred thirty-eight thousand, four hundred twenty-eight".