1897156802 has 18 divisors (see below), whose sum is σ = 3005247609. Its totient is φ = 898098840.

The previous prime is 1897156801. The next prime is 1897156819. The reversal of 1897156802 is 2086517981.

It can be written as a sum of positive squares in 2 ways, for example, as 1748828761 + 148328041 = 41819^2 + 12179^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=30799.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1897156801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1169552 + ... + 1171172.

Almost surely, 2^1897156802 is an apocalyptic number.

1897156802 is a deficient number, since it is larger than the sum of its proper divisors (1108090807).

1897156802 is an frugal number, since it uses more digits than its factorization.

1897156802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3282 (or 1642 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 47.

The square root of 1897156802 is about 43556.3635075290. The cubic root of 1897156802 is about 1237.9442180623.

The spelling of 1897156802 in words is "one billion, eight hundred ninety-seven million, one hundred fifty-six thousand, eight hundred two".