18149505 has 32 divisors (see below), whose sum is σ = 32780160. Its totient is φ = 8494080.

The previous prime is 18149501. The next prime is 18149531. The reversal of 18149505 is 50594181.

It is not a de Polignac number, because 18149505 - 2² = 18149501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (18149501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2889 + ... + 6681.

It is an arithmetic number, because the mean of its divisors is an integer number (1024380).

Almost surely, 2^18149505 is an apocalyptic number.

18149505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18149505 is a deficient number, since it is larger than the sum of its proper divisors (14630655).

18149505 is a wasteful number, since it uses less digits than its factorization.

18149505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3841.

The product of its (nonzero) digits is 7200, while the sum is 33.

The square root of 18149505 is about 4260.2235856819. The cubic root of 18149505 is about 262.7977211611.

The spelling of 18149505 in words is "eighteen million, one hundred forty-nine thousand, five hundred five".