18424390 has 16 divisors (see below), whose sum is σ = 33790608. Its totient is φ = 7230496.

The previous prime is 18424381. The next prime is 18424411. The reversal of 18424390 is 9342481.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16852 + ... + 17911.

It is an arithmetic number, because the mean of its divisors is an integer number (2111913).

Almost surely, 2^18424390 is an apocalyptic number.

18424390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18424390 is a deficient number, since it is larger than the sum of its proper divisors (15366218).

18424390 is a wasteful number, since it uses less digits than its factorization.

18424390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34823.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 18424390 is about 4292.3641504420. The cubic root of 18424390 is about 264.1178212233.

The spelling of 18424390 in words is "eighteen million, four hundred twenty-four thousand, three hundred ninety".