40129984 has 28 divisors (see below), whose sum is σ = 79841344. Its totient is φ = 20012544.

The previous prime is 40129961. The next prime is 40129987. The reversal of 40129984 is 48992104.

It is a happy number.

It is a super-2 number, since 2×40129984² = 3220831231680512, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40129987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38332 + ... + 39364.

Almost surely, 2^40129984 is an apocalyptic number.

It is an amenable number.

40129984 is a deficient number, since it is larger than the sum of its proper divisors (39711360).

40129984 is a wasteful number, since it uses less digits than its factorization.

40129984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652 (or 1642 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 40129984 is about 6334.8231230240. The cubic root of 40129984 is about 342.3652379767.

The spelling of 40129984 in words is "forty million, one hundred twenty-nine thousand, nine hundred eighty-four".