1897368885 has 12 divisors (see below), whose sum is σ = 3288772812. Its totient is φ = 1011930048.

The previous prime is 1897368853. The next prime is 1897368887. The reversal of 1897368885 is 5888637981.

It can be written as a sum of positive squares in 2 ways, for example, as 1486333809 + 411035076 = 38553^2 + 20274^2 .

It is not a de Polignac number, because 1897368885 - 2⁵ = 1897368853 is a prime.

It is a super-3 number, since 3×1897368885³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1897368887) 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, 21081832 + ... + 21081921.

It is an arithmetic number, because the mean of its divisors is an integer number (274064401).

Almost surely, 2^1897368885 is an apocalyptic number.

1897368885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1897368885 is a deficient number, since it is larger than the sum of its proper divisors (1391403927).

1897368885 is a wasteful number, since it uses less digits than its factorization.

1897368885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42163764 (or 42163761 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 63.

The square root of 1897368885 is about 43558.7980206066. The cubic root of 1897368885 is about 1237.9903462369.

The spelling of 1897368885 in words is "one billion, eight hundred ninety-seven million, three hundred sixty-eight thousand, eight hundred eighty-five".