18421450 has 24 divisors (see below), whose sum is σ = 36069120. Its totient is φ = 6980400.

The previous prime is 18421439. The next prime is 18421483. The reversal of 18421450 is 5412481.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8746 + ... + 10645.

It is an arithmetic number, because the mean of its divisors is an integer number (1502880).

Almost surely, 2^18421450 is an apocalyptic number.

18421450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18421450 is a deficient number, since it is larger than the sum of its proper divisors (17647670).

18421450 is a wasteful number, since it uses less digits than its factorization.

18421450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19422 (or 19417 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 18421450 is about 4292.0216681652. The cubic root of 18421450 is about 264.1037719531.

The spelling of 18421450 in words is "eighteen million, four hundred twenty-one thousand, four hundred fifty".