40129240 has 32 divisors (see below), whose sum is σ = 90558000. Its totient is φ = 16004224.

The previous prime is 40129237. The next prime is 40129241. The reversal of 40129240 is 4292104.

It is a super-2 number, since 2×40129240² = 3220711805955200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40129241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14271 + ... + 16849.

Almost surely, 2^40129240 is an apocalyptic number.

40129240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40129240 is an abundant number, since it is smaller than the sum of its proper divisors (50428760).

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

40129240 is a wasteful number, since it uses less digits than its factorization.

40129240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2979 (or 2975 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 40129240 is about 6334.7643997232. The cubic root of 40129240 is about 342.3631221746.

The spelling of 40129240 in words is "forty million, one hundred twenty-nine thousand, two hundred forty".