1981873404 has 54 divisors (see below), whose sum is σ = 5827656744. Its totient is φ = 566249040.

The previous prime is 1981873391. The next prime is 1981873417. The reversal of 1981873404 is 4043781891.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1981873391) and next prime (1981873417).

It is a super-3 number, since 3×1981873404³ (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 1981873404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 559992 + ... + 563519.

Almost surely, 2^1981873404 is an apocalyptic number.

1981873404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1981873404 is an abundant number, since it is smaller than the sum of its proper divisors (3845783340).

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

1981873404 is a wasteful number, since it uses less digits than its factorization.

1981873404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123535 (or 1123523 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 1981873404 is about 44518.2367575357. The cubic root of 1981873404 is about 1256.1031456463.

The spelling of 1981873404 in words is "one billion, nine hundred eighty-one million, eight hundred seventy-three thousand, four hundred four".