1994857209 has 12 divisors (see below), whose sum is σ = 2888151552. Its totient is φ = 1326816600.

The previous prime is 1994857181. The next prime is 1994857211. The reversal of 1994857209 is 9027584991.

1994857209 is a `hidden beast` number, since 1 + 99 + 485 + 72 + 0 + 9 = 666.

It is not a de Polignac number, because 1994857209 - 2²⁹ = 1457986297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1994857309) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 253257 + ... + 261014.

It is an arithmetic number, because the mean of its divisors is an integer number (240679296).

Almost surely, 2^1994857209 is an apocalyptic number.

It is an amenable number.

1994857209 is a deficient number, since it is larger than the sum of its proper divisors (893294343).

1994857209 is a wasteful number, since it uses less digits than its factorization.

1994857209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514708 (or 514705 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The square root of 1994857209 is about 44663.8243884242. The cubic root of 1994857209 is about 1258.8402044985.

The spelling of 1994857209 in words is "one billion, nine hundred ninety-four million, eight hundred fifty-seven thousand, two hundred nine".