18729001 has 4 divisors (see below), whose sum is σ = 18848452. Its totient is φ = 18609552.

The previous prime is 18728977. The next prime is 18729023. The reversal of 18729001 is 10092781.

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 3705625 + 15023376 = 1925^2 + 3876^2 .

It is a cyclic number.

It is not a de Polignac number, because 18729001 - 2⁷ = 18728873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18729031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59490 + ... + 59803.

It is an arithmetic number, because the mean of its divisors is an integer number (4712113).

Almost surely, 2^18729001 is an apocalyptic number.

It is an amenable number.

18729001 is a deficient number, since it is larger than the sum of its proper divisors (119451).

18729001 is a wasteful number, since it uses less digits than its factorization.

18729001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119450.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 18729001 is about 4327.7015839820. The cubic root of 18729001 is about 265.5654285048.

The spelling of 18729001 in words is "eighteen million, seven hundred twenty-nine thousand, one".