18149021 has 8 divisors (see below), whose sum is σ = 19846944. Its totient is φ = 16459120.

The previous prime is 18149017. The next prime is 18149023. The reversal of 18149021 is 12094181.

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 18149021 - 2² = 18149017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18149023) 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, 3371 + ... + 6903.

It is an arithmetic number, because the mean of its divisors is an integer number (2480868).

Almost surely, 2^18149021 is an apocalyptic number.

18149021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18149021 is a deficient number, since it is larger than the sum of its proper divisors (1697923).

18149021 is a wasteful number, since it uses less digits than its factorization.

18149021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4011.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 18149021 is about 4260.1667807728. The cubic root of 18149021 is about 262.7953850969.

The spelling of 18149021 in words is "eighteen million, one hundred forty-nine thousand, twenty-one".