1881634 has 4 divisors (see below), whose sum is σ = 2822454. Its totient is φ = 940816.

The previous prime is 1881631. The next prime is 1881641. The reversal of 1881634 is 4361881.

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

It can be written as a sum of positive squares in only one way, i.e., 1525225 + 356409 = 1235^2 + 597^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1881596 and 1881605.

It is not an unprimeable number, because it can be changed into a prime (1881631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 470407 + ... + 470410.

2^1881634 is an apocalyptic number.

1881634 is a deficient number, since it is larger than the sum of its proper divisors (940820).

1881634 is an equidigital number, since it uses as much as digits as its factorization.

1881634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940819.

The product of its digits is 4608, while the sum is 31.

The square root of 1881634 is about 1371.7266491543. The cubic root of 1881634 is about 123.4558623220.

The spelling of 1881634 in words is "one million, eight hundred eighty-one thousand, six hundred thirty-four".