40143729 has 16 divisors (see below), whose sum is σ = 55641600. Its totient is φ = 25716480.

The previous prime is 40143721. The next prime is 40143731. The reversal of 40143729 is 92734104.

It is a happy number.

It is not a de Polignac number, because 40143729 - 2³ = 40143721 is a prime.

It is a super-2 number, since 2×40143729² = 3223037956050882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40143696 and 40143705.

It is not an unprimeable number, because it can be changed into a prime (40143721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12409 + ... + 15305.

It is an arithmetic number, because the mean of its divisors is an integer number (3477600).

Almost surely, 2^40143729 is an apocalyptic number.

It is an amenable number.

40143729 is a deficient number, since it is larger than the sum of its proper divisors (15497871).

40143729 is a wasteful number, since it uses less digits than its factorization.

40143729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3080.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 40143729 is about 6335.9079065277. The cubic root of 40143729 is about 342.4043215793.

The spelling of 40143729 in words is "forty million, one hundred forty-three thousand, seven hundred twenty-nine".