972391 has 8 divisors (see below), whose sum is σ = 1132704. Its totient is φ = 817440.

The previous prime is 972373. The next prime is 972403. The reversal of 972391 is 193279.

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

It is a cyclic number.

It is not a de Polignac number, because 972391 - 2⁷ = 972263 is a prime.

It is a Duffinian number.

972391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (972091) 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, 940 + ... + 1681.

It is an arithmetic number, because the mean of its divisors is an integer number (141588).

2⁹⁷²³⁹¹ is an apocalyptic number.

972391 is a deficient number, since it is larger than the sum of its proper divisors (160313).

972391 is a wasteful number, since it uses less digits than its factorization.

972391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2681.

The product of its digits is 3402, while the sum is 31.

The square root of 972391 is about 986.0988794234. The cubic root of 972391 is about 99.0710981302.

The spelling of 972391 in words is "nine hundred seventy-two thousand, three hundred ninety-one".