40722138 has 24 divisors (see below), whose sum is σ = 88370100. Its totient is φ = 13552704.

The previous prime is 40722113. The next prime is 40722139. The reversal of 40722138 is 83122704.

40722138 is a `hidden beast` number, since 407 + 221 + 38 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 36324729 + 4397409 = 6027^2 + 2097^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40722139) 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, 13558 + ... + 16286.

Almost surely, 2^40722138 is an apocalyptic number.

40722138 is an abundant number, since it is smaller than the sum of its proper divisors (47647962).

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

40722138 is a wasteful number, since it uses less digits than its factorization.

40722138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3566 (or 3563 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 40722138 is about 6381.3899739790. The cubic root of 40722138 is about 344.0409913745.

The spelling of 40722138 in words is "forty million, seven hundred twenty-two thousand, one hundred thirty-eight".