1913891 has 12 divisors (see below), whose sum is σ = 2250360. Its totient is φ = 1622880.

The previous prime is 1913867. The next prime is 1913893. The reversal of 1913891 is 1983191.

It is not a de Polignac number, because 1913891 - 2⁶ = 1913827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1913893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6671 + ... + 6951.

It is an arithmetic number, because the mean of its divisors is an integer number (187530).

2^1913891 is an apocalyptic number.

1913891 is a deficient number, since it is larger than the sum of its proper divisors (336469).

1913891 is a wasteful number, since it uses less digits than its factorization.

1913891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434 (or 427 counting only the distinct ones).

The product of its digits is 1944, while the sum is 32.

The square root of 1913891 is about 1383.4344942931. The cubic root of 1913891 is about 124.1573401600.

The spelling of 1913891 in words is "one million, nine hundred thirteen thousand, eight hundred ninety-one".