1969897 has 4 divisors (see below), whose sum is σ = 1985536. Its totient is φ = 1954260.

The previous prime is 1969889. The next prime is 1969907. The reversal of 1969897 is 7989691.

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: 7989691 = 1307 ⋅6113.

It is a cyclic number.

It is not a de Polignac number, because 1969897 - 2³ = 1969889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1969897.

It is not an unprimeable number, because it can be changed into a prime (1969997) 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, 7629 + ... + 7882.

It is an arithmetic number, because the mean of its divisors is an integer number (496384).

2^1969897 is an apocalyptic number.

It is an amenable number.

1969897 is a deficient number, since it is larger than the sum of its proper divisors (15639).

1969897 is a wasteful number, since it uses less digits than its factorization.

1969897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15638.

The product of its digits is 244944, while the sum is 49.

The square root of 1969897 is about 1403.5301920515. The cubic root of 1969897 is about 125.3567833430.

The spelling of 1969897 in words is "one million, nine hundred sixty-nine thousand, eight hundred ninety-seven".