18434949720 has 256 divisors, whose sum is σ = 62980001280. Its totient is φ = 4277145600.

The previous prime is 18434949703. The next prime is 18434949721. The reversal of 18434949720 is 2794943481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18434949721) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2865147 + ... + 2871573.

It is an arithmetic number, because the mean of its divisors is an integer number (246015630).

Almost surely, 2^18434949720 is an apocalyptic number.

18434949720 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 18434949720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31490000640).

18434949720 is an abundant number, since it is smaller than the sum of its proper divisors (44545051560).

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

18434949720 is a wasteful number, since it uses less digits than its factorization.

18434949720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6546 (or 6542 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 51.

The spelling of 18434949720 in words is "eighteen billion, four hundred thirty-four million, nine hundred forty-nine thousand, seven hundred twenty".