1919969 has 4 divisors (see below), whose sum is σ = 2021040. Its totient is φ = 1818900.

The previous prime is 1919959. The next prime is 1919987. The reversal of 1919969 is 9699191.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1919969 - 2²⁰ = 871393 is a prime.

It is a super-2 number, since 2×1919969² = 7372561921922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1919959) 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, 50507 + ... + 50544.

It is an arithmetic number, because the mean of its divisors is an integer number (505260).

2^1919969 is an apocalyptic number.

1919969 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1919969 is a deficient number, since it is larger than the sum of its proper divisors (101071).

1919969 is a wasteful number, since it uses less digits than its factorization.

1919969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101070.

The product of its digits is 39366, while the sum is 44.

The square root of 1919969 is about 1385.6294598485. The cubic root of 1919969 is about 124.2886313164.

The spelling of 1919969 in words is "one million, nine hundred nineteen thousand, nine hundred sixty-nine".