1897122799 has 16 divisors (see below), whose sum is σ = 2251781280. Its totient is φ = 1575567360.

The previous prime is 1897122797. The next prime is 1897122817. The reversal of 1897122799 is 9972217981.

It is a cyclic number.

It is not a de Polignac number, because 1897122799 - 2¹ = 1897122797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1897122797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54514 + ... + 82255.

It is an arithmetic number, because the mean of its divisors is an integer number (140736330).

Almost surely, 2^1897122799 is an apocalyptic number.

1897122799 is a deficient number, since it is larger than the sum of its proper divisors (354658481).

1897122799 is a wasteful number, since it uses less digits than its factorization.

1897122799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136890.

The product of its digits is 1143072, while the sum is 55.

The square root of 1897122799 is about 43555.9731724594. The cubic root of 1897122799 is about 1237.9368220704.

The spelling of 1897122799 in words is "one billion, eight hundred ninety-seven million, one hundred twenty-two thousand, seven hundred ninety-nine".