19434435090 has 128 divisors (see below), whose sum is σ = 53739624960. Its totient is φ = 4406181888.

The previous prime is 19434435047. The next prime is 19434435103. The reversal of 19434435090 is 9053443491.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15812596 + ... + 15813824.

It is an arithmetic number, because the mean of its divisors is an integer number (419840820).

Almost surely, 2^19434435090 is an apocalyptic number.

19434435090 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 19434435090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26869812480).

19434435090 is an abundant number, since it is smaller than the sum of its proper divisors (34305189870).

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

19434435090 is a wasteful number, since it uses less digits than its factorization.

19434435090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1796.

The product of its (nonzero) digits is 233280, while the sum is 42.

The spelling of 19434435090 in words is "nineteen billion, four hundred thirty-four million, four hundred thirty-five thousand, ninety".