561840385 has 8 divisors (see below), whose sum is σ = 676088640. Its totient is φ = 448218864.

The previous prime is 561840371. The next prime is 561840401. The reversal of 561840385 is 583048165.

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

It is a cyclic number.

It is not a de Polignac number, because 561840385 - 2¹⁹ = 561316097 is a prime.

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, 154707 + ... + 158296.

It is an arithmetic number, because the mean of its divisors is an integer number (84511080).

Almost surely, 2^561840385 is an apocalyptic number.

It is an amenable number.

561840385 is a deficient number, since it is larger than the sum of its proper divisors (114248255).

561840385 is a wasteful number, since it uses less digits than its factorization.

561840385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313367.

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 561840385 is about 23703.1724669927. The cubic root of 561840385 is about 825.1590192398.

The spelling of 561840385 in words is "five hundred sixty-one million, eight hundred forty thousand, three hundred eighty-five".