18456739840 has 576 divisors, whose sum is σ = 59618500200. Its totient is φ = 5449973760.

The previous prime is 18456739837. The next prime is 18456739849. The reversal of 18456739840 is 4893765481.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18456739849) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 971407351 + ... + 971407369.

Almost surely, 2^18456739840 is an apocalyptic number.

18456739840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18456739840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29809250100).

18456739840 is an abundant number, since it is smaller than the sum of its proper divisors (41161760360).

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

18456739840 is an equidigital number, since it uses as much as digits as its factorization.

18456739840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90 (or 44 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 55.

It can be divided in two parts, 18456 and 739840, that added together give a triangular number (758296 = T₁₂₃₁).

The spelling of 18456739840 in words is "eighteen billion, four hundred fifty-six million, seven hundred thirty-nine thousand, eight hundred forty".