1931397 has 8 divisors (see below), whose sum is σ = 2773344. Its totient is φ = 1188528.

The previous prime is 1931383. The next prime is 1931399. The reversal of 1931397 is 7931391.

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

It is not a de Polignac number, because 1931397 - 2⁴ = 1931381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1931399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24723 + ... + 24800.

It is an arithmetic number, because the mean of its divisors is an integer number (346668).

2^1931397 is an apocalyptic number.

It is an amenable number.

1931397 is a deficient number, since it is larger than the sum of its proper divisors (841947).

1931397 is a wasteful number, since it uses less digits than its factorization.

1931397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49539.

The product of its digits is 5103, while the sum is 33.

The square root of 1931397 is about 1389.7470992954. The cubic root of 1931397 is about 124.5347397451.

The spelling of 1931397 in words is "one million, nine hundred thirty-one thousand, three hundred ninety-seven".