138436092 has 72 divisors (see below), whose sum is σ = 367903536. Its totient is φ = 43835904.

The previous prime is 138436087. The next prime is 138436093. The reversal of 138436092 is 290634831.

138436092 is a `hidden beast` number, since 1 + 3 + 8 + 43 + 609 + 2 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138436093) 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 23 ways as a sum of consecutive naturals, for example, 56068 + ... + 58484.

Almost surely, 2^138436092 is an apocalyptic number.

138436092 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138436092, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183951768).

138436092 is an abundant number, since it is smaller than the sum of its proper divisors (229467444).

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

138436092 is a wasteful number, since it uses less digits than its factorization.

138436092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2507 (or 2502 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 138436092 is about 11765.8867919082. The cubic root of 138436092 is about 517.3086935528.

The spelling of 138436092 in words is "one hundred thirty-eight million, four hundred thirty-six thousand, ninety-two".