1897231394 has 16 divisors (see below), whose sum is σ = 2895424056. Its totient is φ = 932121600.

The previous prime is 1897231393. The next prime is 1897231397. The reversal of 1897231394 is 4931327981.

It can be written as a sum of positive squares in 4 ways, for example, as 1777044025 + 120187369 = 42155^2 + 10963^2 .

It is not an unprimeable number, because it can be changed into a prime (1897231393) 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 7 ways as a sum of consecutive naturals, for example, 122114 + ... + 136770.

Almost surely, 2^1897231394 is an apocalyptic number.

1897231394 is a deficient number, since it is larger than the sum of its proper divisors (998192662).

1897231394 is a wasteful number, since it uses less digits than its factorization.

1897231394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15781.

The product of its digits is 326592, while the sum is 47.

The square root of 1897231394 is about 43557.2197689430. The cubic root of 1897231394 is about 1237.9604422572.

The spelling of 1897231394 in words is "one billion, eight hundred ninety-seven million, two hundred thirty-one thousand, three hundred ninety-four".