40490784 has 36 divisors (see below), whose sum is σ = 115146486. Its totient is φ = 13496832.

The previous prime is 40490783. The next prime is 40490809. The reversal of 40490784 is 48709404.

It can be written as a sum of positive squares in only one way, i.e., 25280784 + 15210000 = 5028^2 + 3900^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×40490784³ (a number of 24 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40490783) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 70009 + ... + 70584.

Almost surely, 2^40490784 is an apocalyptic number.

It is an amenable number.

40490784 is an abundant number, since it is smaller than the sum of its proper divisors (74655702).

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

40490784 is a wasteful number, since it uses less digits than its factorization.

40490784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140609 (or 140598 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 40490784 is about 6363.2369121383. The cubic root of 40490784 is about 343.3882221814.

The spelling of 40490784 in words is "forty million, four hundred ninety thousand, seven hundred eighty-four".