1231842816 has 120 divisors (see below), whose sum is σ = 3687227544. Its totient is φ = 410572800.

The previous prime is 1231842779. The next prime is 1231842839. The reversal of 1231842816 is 6182481321.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 119466 + ... + 129366.

Almost surely, 2^1231842816 is an apocalyptic number.

1231842816 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 1231842816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1843613772).

1231842816 is an abundant number, since it is smaller than the sum of its proper divisors (2455384728).

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

1231842816 is an frugal number, since it uses more digits than its factorization.

1231842816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9934 (or 9906 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 1231842816 is about 35097.6183807392. The cubic root of 1231842816 is about 1071.9760891674.

The spelling of 1231842816 in words is "one billion, two hundred thirty-one million, eight hundred forty-two thousand, eight hundred sixteen".