1881566 has 4 divisors (see below), whose sum is σ = 2822352. Its totient is φ = 940782.

The previous prime is 1881559. The next prime is 1881587. The reversal of 1881566 is 6651881.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×1881566² = 7080581224712, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 470390 + ... + 470393.

It is an arithmetic number, because the mean of its divisors is an integer number (705588).

2^1881566 is an apocalyptic number.

1881566 is a deficient number, since it is larger than the sum of its proper divisors (940786).

1881566 is an equidigital number, since it uses as much as digits as its factorization.

1881566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940785.

The product of its digits is 11520, while the sum is 35.

The square root of 1881566 is about 1371.7018626509. The cubic root of 1881566 is about 123.4543751217.

It can be divided in two parts, 18815 and 66, that added together give a palindrome (18881).

The spelling of 1881566 in words is "one million, eight hundred eighty-one thousand, five hundred sixty-six".