1981858032 has 180 divisors, whose sum is σ = 6967870000. Its totient is φ = 514736640.

The previous prime is 1981858013. The next prime is 1981858033. The reversal of 1981858032 is 2308581891.

It is a happy number.

It is a super-2 number, since 2×1981858032² = 7855522518005826048, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981858033) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 113844 + ... + 130092.

Almost surely, 2^1981858032 is an apocalyptic number.

1981858032 is a gapful number since it is divisible by the number (12) 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 1981858032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3483935000).

1981858032 is an abundant number, since it is smaller than the sum of its proper divisors (4986011968).

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

1981858032 is a wasteful number, since it uses less digits than its factorization.

1981858032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16292 (or 16272 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 1981858032 is about 44518.0641088536. The cubic root of 1981858032 is about 1256.0998980680.

The spelling of 1981858032 in words is "one billion, nine hundred eighty-one million, eight hundred fifty-eight thousand, thirty-two".