40646129 has 8 divisors (see below), whose sum is σ = 43448832. Its totient is φ = 37929760.

The previous prime is 40646113. The next prime is 40646141. The reversal of 40646129 is 92164604.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40646129 - 2⁴ = 40646113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40646095 and 40646104.

It is not an unprimeable number, because it can be changed into a prime (40646329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20609 + ... + 22494.

It is an arithmetic number, because the mean of its divisors is an integer number (5431104).

Almost surely, 2^40646129 is an apocalyptic number.

It is an amenable number.

40646129 is a deficient number, since it is larger than the sum of its proper divisors (2802703).

40646129 is a wasteful number, since it uses less digits than its factorization.

40646129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43167.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 40646129 is about 6375.4316716596. The cubic root of 40646129 is about 343.8268040395.

The spelling of 40646129 in words is "forty million, six hundred forty-six thousand, one hundred twenty-nine".