36138438 has 24 divisors (see below), whose sum is σ = 89485968. Its totient is φ = 10325232.

The previous prime is 36138433. The next prime is 36138457. The reversal of 36138438 is 83483163.

It is a happy number.

36138438 is a `hidden beast` number, since 3 + 613 + 8 + 4 + 38 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36138433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143281 + ... + 143532.

It is an arithmetic number, because the mean of its divisors is an integer number (3728582).

Almost surely, 2^36138438 is an apocalyptic number.

36138438 is an abundant number, since it is smaller than the sum of its proper divisors (53347530).

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

36138438 is a wasteful number, since it uses less digits than its factorization.

36138438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286828 (or 286825 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 36138438 is about 6011.5254303712. The cubic root of 36138438 is about 330.6154355482.

The spelling of 36138438 in words is "thirty-six million, one hundred thirty-eight thousand, four hundred thirty-eight".