189123456 has 64 divisors (see below), whose sum is σ = 505720080. Its totient is φ = 62619648.

The previous prime is 189123443. The next prime is 189123499. The reversal of 189123456 is 654321981.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58720 + ... + 61856.

Almost surely, 2^189123456 is an apocalyptic number.

189123456 is a gapful number since it is divisible by the number (16) 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 189123456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252860040).

189123456 is an abundant number, since it is smaller than the sum of its proper divisors (316596624).

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

189123456 is a wasteful number, since it uses less digits than its factorization.

189123456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3311 (or 3299 counting only the distinct ones).

The product of its digits is 51840, while the sum is 39.

The square root of 189123456 is about 13752.2164031839. The cubic root of 189123456 is about 574.0042815141.

The spelling of 189123456 in words is "one hundred eighty-nine million, one hundred twenty-three thousand, four hundred fifty-six".