916381 has 4 divisors (see below), whose sum is σ = 921852. Its totient is φ = 910912.

The previous prime is 916367. The next prime is 916387. The reversal of 916381 is 183619.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 183619 = 139 ⋅1321.

It can be written as a sum of positive squares in 2 ways, for example, as 793881 + 122500 = 891^2 + 350^2 .

It is a cyclic number.

It is not a de Polignac number, because 916381 - 2⁹ = 915869 is a prime.

It is a super-2 number, since 2×916381² = 1679508274322, which contains 22 as substring.

It is a Duffinian number.

916381 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (916387) 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, 2476 + ... + 2821.

It is an arithmetic number, because the mean of its divisors is an integer number (230463).

2⁹¹⁶³⁸¹ is an apocalyptic number.

It is an amenable number.

916381 is a deficient number, since it is larger than the sum of its proper divisors (5471).

916381 is a wasteful number, since it uses less digits than its factorization.

916381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5470.

The product of its digits is 1296, while the sum is 28.

The square root of 916381 is about 957.2779115805. The cubic root of 916381 is about 97.1311860876.

The spelling of 916381 in words is "nine hundred sixteen thousand, three hundred eighty-one".