1981800462 has 32 divisors (see below), whose sum is σ = 4034717568. Its totient is φ = 648840416.

The previous prime is 1981800439. The next prime is 1981800511. The reversal of 1981800462 is 2640081891.

It is a super-3 number, since 3×1981800462³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1981800462.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74653 + ... + 97655.

It is an arithmetic number, because the mean of its divisors is an integer number (126084924).

Almost surely, 2^1981800462 is an apocalyptic number.

1981800462 is an abundant number, since it is smaller than the sum of its proper divisors (2052917106).

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

1981800462 is a wasteful number, since it uses less digits than its factorization.

1981800462 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23264.

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 1981800462 is about 44517.4175126995. The cubic root of 1981800462 is about 1256.0877353449.

The spelling of 1981800462 in words is "one billion, nine hundred eighty-one million, eight hundred thousand, four hundred sixty-two".