3899561 has 4 divisors (see below), whose sum is σ = 3904512. Its totient is φ = 3894612.

The previous prime is 3899549. The next prime is 3899569. The reversal of 3899561 is 1659983.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1659983 = 13 ⋅127691.

It is a cyclic number.

It is not a de Polignac number, because 3899561 - 2¹⁰ = 3898537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3899569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1001 + ... + 2966.

It is an arithmetic number, because the mean of its divisors is an integer number (976128).

Almost surely, 2^3899561 is an apocalyptic number.

It is an amenable number.

3899561 is a deficient number, since it is larger than the sum of its proper divisors (4951).

3899561 is an equidigital number, since it uses as much as digits as its factorization.

3899561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4950.

The product of its digits is 58320, while the sum is 41.

The square root of 3899561 is about 1974.7306145396. The cubic root of 3899561 is about 157.4001853497.

It can be divided in two parts, 38 and 99561, that added together give a palindrome (99599).

The spelling of 3899561 in words is "three million, eight hundred ninety-nine thousand, five hundred sixty-one".