916639 has 4 divisors (see below), whose sum is σ = 946240. Its totient is φ = 887040.

The previous prime is 916633. The next prime is 916649. The reversal of 916639 is 936619.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 916639 - 2⁷ = 916511 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 (916633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14754 + ... + 14815.

It is an arithmetic number, because the mean of its divisors is an integer number (236560).

2⁹¹⁶⁶³⁹ is an apocalyptic number.

916639 is a deficient number, since it is larger than the sum of its proper divisors (29601).

916639 is a wasteful number, since it uses less digits than its factorization.

916639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29600.

The product of its digits is 8748, while the sum is 34.

The square root of 916639 is about 957.4126592019. The cubic root of 916639 is about 97.1403007442.

The spelling of 916639 in words is "nine hundred sixteen thousand, six hundred thirty-nine".