18521450 has 24 divisors (see below), whose sum is σ = 34872768. Its totient is φ = 7317680.

The previous prime is 18521429. The next prime is 18521453. The reversal of 18521450 is 5412581.

It is a super-2 number, since 2×18521450² = 686088220205000, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18521453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1919 + ... + 6381.

It is an arithmetic number, because the mean of its divisors is an integer number (1453032).

Almost surely, 2^18521450 is an apocalyptic number.

18521450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18521450 is a deficient number, since it is larger than the sum of its proper divisors (16351318).

18521450 is a wasteful number, since it uses less digits than its factorization.

18521450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4558 (or 4553 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 18521450 is about 4303.6554230096. The cubic root of 18521450 is about 264.5808015685.

The spelling of 18521450 in words is "eighteen million, five hundred twenty-one thousand, four hundred fifty".