1939897 has 8 divisors (see below), whose sum is σ = 2024640. Its totient is φ = 1856400.

The previous prime is 1939891. The next prime is 1939901. The reversal of 1939897 is 7989391.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1939897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1939891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4158 + ... + 4600.

It is an arithmetic number, because the mean of its divisors is an integer number (253080).

2^1939897 is an apocalyptic number.

It is an amenable number.

1939897 is a deficient number, since it is larger than the sum of its proper divisors (84743).

1939897 is a wasteful number, since it uses less digits than its factorization.

1939897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623.

The product of its digits is 122472, while the sum is 46.

The square root of 1939897 is about 1392.8018523825. The cubic root of 1939897 is about 124.7171631760.

The spelling of 1939897 in words is "one million, nine hundred thirty-nine thousand, eight hundred ninety-seven".