18429390 has 128 divisors (see below), whose sum is σ = 57600000. Its totient is φ = 4191264.

The previous prime is 18429379. The next prime is 18429419. The reversal of 18429390 is 9392481.

18429390 = T₁₄₁ + T₁₄₂ + ... + T₄₈₃.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 92511 + ... + 92709.

It is an arithmetic number, because the mean of its divisors is an integer number (450000).

Almost surely, 2^18429390 is an apocalyptic number.

18429390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18429390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28800000).

18429390 is an abundant number, since it is smaller than the sum of its proper divisors (39170610).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18429390 is a wasteful number, since it uses less digits than its factorization.

18429390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 18429390 is about 4292.9465405476. The cubic root of 18429390 is about 264.1417111081.

The spelling of 18429390 in words is "eighteen million, four hundred twenty-nine thousand, three hundred ninety".