1913689 has 4 divisors (see below), whose sum is σ = 1924560. Its totient is φ = 1902820.

The previous prime is 1913687. The next prime is 1913701. The reversal of 1913689 is 9863191.

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: 9863191 = 13 ⋅758707.

It is a cyclic number.

It is not a de Polignac number, because 1913689 - 2¹ = 1913687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1913683) 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, 5167 + ... + 5524.

It is an arithmetic number, because the mean of its divisors is an integer number (481140).

2^1913689 is an apocalyptic number.

It is an amenable number.

1913689 is a deficient number, since it is larger than the sum of its proper divisors (10871).

1913689 is a wasteful number, since it uses less digits than its factorization.

1913689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10870.

The product of its digits is 11664, while the sum is 37.

The square root of 1913689 is about 1383.3614856573. The cubic root of 1913689 is about 124.1529719793.

The spelling of 1913689 in words is "one million, nine hundred thirteen thousand, six hundred eighty-nine".