40129749 has 24 divisors (see below), whose sum is σ = 65581152. Its totient is φ = 24319440.

The previous prime is 40129711. The next prime is 40129759. The reversal of 40129749 is 94792104.

It is not a de Polignac number, because 40129749 - 2⁹ = 40129237 is a prime.

It is a super-2 number, since 2×40129749² = 3220793509606002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40129759) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4834 + ... + 10179.

It is an arithmetic number, because the mean of its divisors is an integer number (2732548).

Almost surely, 2^40129749 is an apocalyptic number.

It is an amenable number.

40129749 is a deficient number, since it is larger than the sum of its proper divisors (25451403).

40129749 is a wasteful number, since it uses less digits than its factorization.

40129749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15039 (or 15027 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 40129749 is about 6334.8045747284. The cubic root of 40129749 is about 342.3645696819.

The spelling of 40129749 in words is "forty million, one hundred twenty-nine thousand, seven hundred forty-nine".