1994151580 has 12 divisors (see below), whose sum is σ = 4187718360. Its totient is φ = 797660624.

The previous prime is 1994151521. The next prime is 1994151581. The reversal of 1994151580 is 851514991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1994151581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49853770 + ... + 49853809.

It is an arithmetic number, because the mean of its divisors is an integer number (348976530).

Almost surely, 2^1994151580 is an apocalyptic number.

1994151580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1994151580 is an abundant number, since it is smaller than the sum of its proper divisors (2193566780).

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

1994151580 is a wasteful number, since it uses less digits than its factorization.

1994151580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99707588 (or 99707586 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 43.

The square root of 1994151580 is about 44655.9243550058. The cubic root of 1994151580 is about 1258.6917596364.

The spelling of 1994151580 in words is "one billion, nine hundred ninety-four million, one hundred fifty-one thousand, five hundred eighty".