1897456394 has 16 divisors (see below), whose sum is σ = 3172219200. Its totient is φ = 845924544.

The previous prime is 1897456387. The next prime is 1897456403. The reversal of 1897456394 is 4936547981.

It is an unprimeable number.

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, 1467974 + ... + 1469265.

It is an arithmetic number, because the mean of its divisors is an integer number (198263700).

Almost surely, 2^1897456394 is an apocalyptic number.

1897456394 is a deficient number, since it is larger than the sum of its proper divisors (1274762806).

1897456394 is a wasteful number, since it uses less digits than its factorization.

1897456394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2937277.

The product of its digits is 6531840, while the sum is 56.

The square root of 1897456394 is about 43559.8025018480. The cubic root of 1897456394 is about 1238.0093784931.

The spelling of 1897456394 in words is "one billion, eight hundred ninety-seven million, four hundred fifty-six thousand, three hundred ninety-four".