1891534 has 4 divisors (see below), whose sum is σ = 2837304. Its totient is φ = 945766.

The previous prime is 1891529. The next prime is 1891537. The reversal of 1891534 is 4351981.

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

It is a junction number, because it is equal to n+sod(n) for n = 1891496 and 1891505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1891537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 472882 + ... + 472885.

It is an arithmetic number, because the mean of its divisors is an integer number (709326).

2^1891534 is an apocalyptic number.

1891534 is a deficient number, since it is larger than the sum of its proper divisors (945770).

1891534 is an equidigital number, since it uses as much as digits as its factorization.

1891534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945769.

The product of its digits is 4320, while the sum is 31.

The square root of 1891534 is about 1375.3305057331. The cubic root of 1891534 is about 123.6719999573.

The spelling of 1891534 in words is "one million, eight hundred ninety-one thousand, five hundred thirty-four".