40381632 has 56 divisors (see below), whose sum is σ = 118719600. Its totient is φ = 13459968.

The previous prime is 40381619. The next prime is 40381657. The reversal of 40381632 is 23618304.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 40381596 and 40381605.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9957 + ... + 13412.

Almost surely, 2^40381632 is an apocalyptic number.

It is an amenable number.

40381632 is an abundant number, since it is smaller than the sum of its proper divisors (78337968).

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

40381632 is a wasteful number, since it uses less digits than its factorization.

40381632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23390 (or 23374 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 40381632 is about 6354.6543572408. The cubic root of 40381632 is about 343.0793844822.

Adding to 40381632 its reverse (23618304), we get a palindrome (63999936).

The spelling of 40381632 in words is "forty million, three hundred eighty-one thousand, six hundred thirty-two".