1919797 has 4 divisors (see below), whose sum is σ = 2094336. Its totient is φ = 1745260.

The previous prime is 1919789. The next prime is 1919839. The reversal of 1919797 is 7979191.

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: 7979191 = 11 ⋅725381.

It is not a de Polignac number, because 1919797 - 2³ = 1919789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1919767) 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, 87253 + ... + 87274.

It is an arithmetic number, because the mean of its divisors is an integer number (523584).

2^1919797 is an apocalyptic number.

It is an amenable number.

1919797 is a deficient number, since it is larger than the sum of its proper divisors (174539).

1919797 is a wasteful number, since it uses less digits than its factorization.

1919797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174538.

The product of its digits is 35721, while the sum is 43.

The square root of 1919797 is about 1385.5673928034. The cubic root of 1919797 is about 124.2849197491.

The spelling of 1919797 in words is "one million, nine hundred nineteen thousand, seven hundred ninety-seven".