1994413680 has 180 divisors, whose sum is σ = 7791579432. Its totient is φ = 455857920.

The previous prime is 1994413669. The next prime is 1994413703. The reversal of 1994413680 is 863144991.

It is a tau number, because it is divible by the number of its divisors (180).

It is a super-2 number, since 2×1994413680² = 7955371853942284800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7015 + ... + 63545.

Almost surely, 2^1994413680 is an apocalyptic number.

1994413680 is a gapful number since it is divisible by the number (10) 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 1994413680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3895789716).

1994413680 is an abundant number, since it is smaller than the sum of its proper divisors (5797165752).

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

1994413680 is a wasteful number, since it uses less digits than its factorization.

1994413680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56564 (or 56548 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 1994413680 is about 44658.8589195918. The cubic root of 1994413680 is about 1258.7469023281.

The spelling of 1994413680 in words is "one billion, nine hundred ninety-four million, four hundred thirteen thousand, six hundred eighty".