1881540365 has 8 divisors (see below), whose sum is σ = 2390663160. Its totient is φ = 1416689152.

The previous prime is 1881540347. The next prime is 1881540377. The reversal of 1881540365 is 5630451881.

It can be written as a sum of positive squares in 4 ways, for example, as 420619081 + 1460921284 = 20509^2 + 38222^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1881540365 - 2²⁶ = 1814431501 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11067800 + ... + 11067969.

It is an arithmetic number, because the mean of its divisors is an integer number (298832895).

Almost surely, 2^1881540365 is an apocalyptic number.

It is an amenable number.

1881540365 is a deficient number, since it is larger than the sum of its proper divisors (509122795).

1881540365 is a wasteful number, since it uses less digits than its factorization.

1881540365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22135791.

The product of its (nonzero) digits is 115200, while the sum is 41.

The square root of 1881540365 is about 43376.7260751662. The cubic root of 1881540365 is about 1234.5381445980.

The spelling of 1881540365 in words is "one billion, eight hundred eighty-one million, five hundred forty thousand, three hundred sixty-five".