18507429 has 6 divisors (see below), whose sum is σ = 26732966. Its totient is φ = 12338280.

The previous prime is 18507427. The next prime is 18507449. The reversal of 18507429 is 92470581.

It can be written as a sum of positive squares in only one way, i.e., 18507204 + 225 = 4302^2 + 15^2 .

It is not a de Polignac number, because 18507429 - 2¹ = 18507427 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18507393 and 18507402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18507427) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1028182 + ... + 1028199.

Almost surely, 2^18507429 is an apocalyptic number.

It is an amenable number.

18507429 is a deficient number, since it is larger than the sum of its proper divisors (8225537).

18507429 is a wasteful number, since it uses less digits than its factorization.

18507429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2056387 (or 2056384 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 18507429 is about 4302.0261505481. The cubic root of 18507429 is about 264.5140209095.

The spelling of 18507429 in words is "eighteen million, five hundred seven thousand, four hundred twenty-nine".