18426408 has 192 divisors, whose sum is σ = 63244800. Its totient is φ = 4343040.

The previous prime is 18426389. The next prime is 18426433. The reversal of 18426408 is 80462481.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 312283 + ... + 312341.

It is an arithmetic number, because the mean of its divisors is an integer number (329400).

Almost surely, 2^18426408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18426408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31622400).

18426408 is an abundant number, since it is smaller than the sum of its proper divisors (44818392).

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

18426408 is a wasteful number, since it uses less digits than its factorization.

18426408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 18426408 is about 4292.5992125984. The cubic root of 18426408 is about 264.1274637010.

Adding to 18426408 its reverse (80462481), we get a palindrome (98888889).

It can be divided in two parts, 18 and 426408, that added together give a triangular number (426426 = T₉₂₃).

The spelling of 18426408 in words is "eighteen million, four hundred twenty-six thousand, four hundred eight".