18729629 has 4 divisors (see below), whose sum is σ = 18849084. Its totient is φ = 18610176.

The previous prime is 18729593. The next prime is 18729647. The reversal of 18729629 is 92692781.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12945604 + 5784025 = 3598^2 + 2405^2 .

It is a cyclic number.

It is not a de Polignac number, because 18729629 - 2²⁴ = 1952413 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 18729629.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18729229) 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, 59492 + ... + 59805.

It is an arithmetic number, because the mean of its divisors is an integer number (4712271).

Almost surely, 2^18729629 is an apocalyptic number.

It is an amenable number.

18729629 is a deficient number, since it is larger than the sum of its proper divisors (119455).

18729629 is a wasteful number, since it uses less digits than its factorization.

18729629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119454.

The product of its digits is 108864, while the sum is 44.

The square root of 18729629 is about 4327.7741392083. The cubic root of 18729629 is about 265.5683966864.

The spelling of 18729629 in words is "eighteen million, seven hundred twenty-nine thousand, six hundred twenty-nine".