18409032642 has 128 divisors (see below), whose sum is σ = 50030991360. Its totient is φ = 4360458240.

The previous prime is 18409032581. The next prime is 18409032643. The reversal of 18409032642 is 24623090481.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 18409032642.

It is not an unprimeable number, because it can be changed into a prime (18409032643) 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, 480034 + ... + 516962.

It is an arithmetic number, because the mean of its divisors is an integer number (390867120).

Almost surely, 2^18409032642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18409032642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25015495680).

18409032642 is an abundant number, since it is smaller than the sum of its proper divisors (31621958718).

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

18409032642 is a wasteful number, since it uses less digits than its factorization.

18409032642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37048.

The product of its (nonzero) digits is 82944, while the sum is 39.

The spelling of 18409032642 in words is "eighteen billion, four hundred nine million, thirty-two thousand, six hundred forty-two".