18990547 has 8 divisors (see below), whose sum is σ = 20408976. Its totient is φ = 17605632.

The previous prime is 18990541. The next prime is 18990599. The reversal of 18990547 is 74509981.

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

It is a cyclic number.

It is not a de Polignac number, because 18990547 - 2³ = 18990539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18990541) 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, 7198 + ... + 9475.

It is an arithmetic number, because the mean of its divisors is an integer number (2551122).

Almost surely, 2^18990547 is an apocalyptic number.

18990547 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

18990547 is a deficient number, since it is larger than the sum of its proper divisors (1418429).

18990547 is a wasteful number, since it uses less digits than its factorization.

18990547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16757.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 18990547 is about 4357.8144751699. The cubic root of 18990547 is about 266.7959041964.

The spelling of 18990547 in words is "eighteen million, nine hundred ninety thousand, five hundred forty-seven".