1994697729 has 12 divisors (see below), whose sum is σ = 3032874000. Its totient is φ = 1259808984.

The previous prime is 1994697721. The next prime is 1994697751. The reversal of 1994697729 is 9277964991.

It is not a de Polignac number, because 1994697729 - 2³ = 1994697721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1994697721) 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, 5832279 + ... + 5832620.

It is an arithmetic number, because the mean of its divisors is an integer number (252739500).

Almost surely, 2^1994697729 is an apocalyptic number.

1994697729 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1994697729 is a deficient number, since it is larger than the sum of its proper divisors (1038176271).

1994697729 is a wasteful number, since it uses less digits than its factorization.

1994697729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11664924 (or 11664921 counting only the distinct ones).

The product of its digits is 15431472, while the sum is 63.

The square root of 1994697729 is about 44662.0390152532. The cubic root of 1994697729 is about 1258.8066573712.

The spelling of 1994697729 in words is "one billion, nine hundred ninety-four million, six hundred ninety-seven thousand, seven hundred twenty-nine".