40129679 has 4 divisors (see below), whose sum is σ = 40163976. Its totient is φ = 40095384.

The previous prime is 40129667. The next prime is 40129703. The reversal of 40129679 is 97692104.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40129679 - 2²⁰ = 39081103 is a prime.

It is a super-2 number, since 2×40129679² = 3220782273286082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40129279) 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, 15329 + ... + 17754.

It is an arithmetic number, because the mean of its divisors is an integer number (10040994).

Almost surely, 2^40129679 is an apocalyptic number.

40129679 is a deficient number, since it is larger than the sum of its proper divisors (34297).

40129679 is a wasteful number, since it uses less digits than its factorization.

40129679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34296.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 40129679 is about 6334.7990496937. The cubic root of 40129679 is about 342.3643706148.

The spelling of 40129679 in words is "forty million, one hundred twenty-nine thousand, six hundred seventy-nine".