40081392 has 180 divisors, whose sum is σ = 128028264. Its totient is φ = 12130560.

The previous prime is 40081381. The next prime is 40081399. The reversal of 40081392 is 29318004.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40081399) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 657042 + ... + 657102.

Almost surely, 2^40081392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40081392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64014132).

40081392 is an abundant number, since it is smaller than the sum of its proper divisors (87946872).

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

40081392 is a wasteful number, since it uses less digits than its factorization.

40081392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 40081392 is about 6330.9866529633. The cubic root of 40081392 is about 342.2269961166.

Adding to 40081392 its reverse (29318004), we get a palindrome (69399396).

The spelling of 40081392 in words is "forty million, eighty-one thousand, three hundred ninety-two".