40138542 has 24 divisors (see below), whose sum is σ = 90748944. Its totient is φ = 12797664.

The previous prime is 40138529. The next prime is 40138577. The reversal of 40138542 is 24583104.

It is a super-2 number, since 2×40138542² = 3222205107771528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48063 + ... + 48890.

It is an arithmetic number, because the mean of its divisors is an integer number (3781206).

Almost surely, 2^40138542 is an apocalyptic number.

40138542 is an abundant number, since it is smaller than the sum of its proper divisors (50610402).

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

40138542 is a wasteful number, since it uses less digits than its factorization.

40138542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96984 (or 96981 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 40138542 is about 6335.4985597031. The cubic root of 40138542 is about 342.3895735081.

The spelling of 40138542 in words is "forty million, one hundred thirty-eight thousand, five hundred forty-two".