1919913 has 8 divisors (see below), whose sum is σ = 2566368. Its totient is φ = 1276704.

The previous prime is 1919891. The next prime is 1919917. The reversal of 1919913 is 3199191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1919913 - 2⁵ = 1919881 is a prime.

1919913 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1919917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1581 + ... + 2517.

It is an arithmetic number, because the mean of its divisors is an integer number (320796).

2^1919913 is an apocalyptic number.

It is an amenable number.

1919913 is a deficient number, since it is larger than the sum of its proper divisors (646455).

1919913 is an equidigital number, since it uses as much as digits as its factorization.

1919913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623.

The product of its digits is 2187, while the sum is 33.

The square root of 1919913 is about 1385.6092522786. The cubic root of 1919913 is about 124.2874229235.

The spelling of 1919913 in words is "one million, nine hundred nineteen thousand, nine hundred thirteen".