1897173729 has 12 divisors (see below), whose sum is σ = 2989486032. Its totient is φ = 1149802200.

The previous prime is 1897173727. The next prime is 1897173737. The reversal of 1897173729 is 9273717981.

It is not a de Polignac number, because 1897173729 - 2¹ = 1897173727 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1897173727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9581587 + ... + 9581784.

It is an arithmetic number, because the mean of its divisors is an integer number (249123836).

Almost surely, 2^1897173729 is an apocalyptic number.

It is an amenable number.

1897173729 is a deficient number, since it is larger than the sum of its proper divisors (1092312303).

1897173729 is a wasteful number, since it uses less digits than its factorization.

1897173729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19163388 (or 19163385 counting only the distinct ones).

The product of its digits is 1333584, while the sum is 54.

The square root of 1897173729 is about 43556.5578185421. The cubic root of 1897173729 is about 1237.9478998208.

The spelling of 1897173729 in words is "one billion, eight hundred ninety-seven million, one hundred seventy-three thousand, seven hundred twenty-nine".