916391 has 16 divisors (see below), whose sum is σ = 1118208. Its totient is φ = 734400.

The previous prime is 916387. The next prime is 916411. The reversal of 916391 is 193619.

916391 = T₁₄₀ + T₁₄₁ + ... + T₂₀₁.

It is a cyclic number.

It is not a de Polignac number, because 916391 - 2² = 916387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (916361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8846 + ... + 8948.

It is an arithmetic number, because the mean of its divisors is an integer number (69888).

2⁹¹⁶³⁹¹ is an apocalyptic number.

916391 is a deficient number, since it is larger than the sum of its proper divisors (201817).

916391 is a wasteful number, since it uses less digits than its factorization.

916391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182.

The product of its digits is 1458, while the sum is 29.

The square root of 916391 is about 957.2831347099. The cubic root of 916391 is about 97.1315394007.

It can be divided in two parts, 91 and 6391, that multiplied together give a triangular number (581581 = T₁₀₇₈).

The spelling of 916391 in words is "nine hundred sixteen thousand, three hundred ninety-one".