39642929 has 4 divisors (see below), whose sum is σ = 41974884. Its totient is φ = 37310976.

The previous prime is 39642919. The next prime is 39642937. The reversal of 39642929 is 92924693.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92924693 = 73 ⋅1272941.

It can be written as a sum of positive squares in 2 ways, for example, as 35378704 + 4264225 = 5948^2 + 2065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39642929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39642929.

It is not an unprimeable number, because it can be changed into a prime (39642919) 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, 1165952 + ... + 1165985.

It is an arithmetic number, because the mean of its divisors is an integer number (10493721).

Almost surely, 2^39642929 is an apocalyptic number.

It is an amenable number.

39642929 is a deficient number, since it is larger than the sum of its proper divisors (2331955).

39642929 is a wasteful number, since it uses less digits than its factorization.

39642929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2331954.

The product of its digits is 209952, while the sum is 44.

The square root of 39642929 is about 6296.2630980606. The cubic root of 39642929 is about 340.9745081175.

The spelling of 39642929 in words is "thirty-nine million, six hundred forty-two thousand, nine hundred twenty-nine".