1868261369 has 6 divisors (see below), whose sum is σ = 2023028766. Its totient is φ = 1724548800.

The previous prime is 1868261357. The next prime is 1868261371. The reversal of 1868261369 is 9631628681.

It can be written as a sum of positive squares in 3 ways, for example, as 243204025 + 1625057344 = 15595^2 + 40312^2 .

It is not a de Polignac number, because 1868261369 - 2²⁰ = 1867212793 is a prime.

It is a super-2 number, since 2×1868261369² = 6980801085795508322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1868261069) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5527232 + ... + 5527569.

It is an arithmetic number, because the mean of its divisors is an integer number (337171461).

Almost surely, 2^1868261369 is an apocalyptic number.

It is an amenable number.

1868261369 is a deficient number, since it is larger than the sum of its proper divisors (154767397).

1868261369 is a wasteful number, since it uses less digits than its factorization.

1868261369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11054827 (or 11054814 counting only the distinct ones).

The product of its digits is 746496, while the sum is 50.

The square root of 1868261369 is about 43223.3891429166. The cubic root of 1868261369 is about 1231.6270289816.

The spelling of 1868261369 in words is "one billion, eight hundred sixty-eight million, two hundred sixty-one thousand, three hundred sixty-nine".