40509644 has 24 divisors (see below), whose sum is σ = 82000128. Its totient is φ = 17151120.

The previous prime is 40509641. The next prime is 40509659. The reversal of 40509644 is 44690504.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 40509644.

It is not an unprimeable number, because it can be changed into a prime (40509641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6392 + ... + 11039.

It is an arithmetic number, because the mean of its divisors is an integer number (3416672).

Almost surely, 2^40509644 is an apocalyptic number.

It is an amenable number.

40509644 is an abundant number, since it is smaller than the sum of its proper divisors (41490484).

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

40509644 is a wasteful number, since it uses less digits than its factorization.

40509644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17525 (or 17523 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 40509644 is about 6364.7186897773. The cubic root of 40509644 is about 343.4415289339.

The spelling of 40509644 in words is "forty million, five hundred nine thousand, six hundred forty-four".