672391 has 8 divisors (see below), whose sum is σ = 725120. Its totient is φ = 621432.

The previous prime is 672379. The next prime is 672439. The reversal of 672391 is 193276.

672391 = 3³ + 4³ + ... + 40³.

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 672391 - 2¹¹ = 670343 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 (672311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 406 + ... + 1228.

It is an arithmetic number, because the mean of its divisors is an integer number (90640).

2⁶⁷²³⁹¹ is an apocalyptic number.

672391 is a deficient number, since it is larger than the sum of its proper divisors (52729).

672391 is a wasteful number, since it uses less digits than its factorization.

672391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885.

The product of its digits is 2268, while the sum is 28.

The square root of 672391 is about 819.9945121768. The cubic root of 672391 is about 87.6073675197.

The spelling of 672391 in words is "six hundred seventy-two thousand, three hundred ninety-one".