991394 has 8 divisors (see below), whose sum is σ = 1538460. Its totient is φ = 478576.

The previous prime is 991387. The next prime is 991409. The reversal of 991394 is 493199.

It can be written as a sum of positive squares in 2 ways, for example, as 990025 + 1369 = 995^2 + 37^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8489 + ... + 8604.

2⁹⁹¹³⁹⁴ is an apocalyptic number.

991394 is a deficient number, since it is larger than the sum of its proper divisors (547066).

991394 is a wasteful number, since it uses less digits than its factorization.

991394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17124.

The product of its digits is 8748, while the sum is 35.

The square root of 991394 is about 995.6877020432. The cubic root of 991394 is about 99.7123064513.

The spelling of 991394 in words is "nine hundred ninety-one thousand, three hundred ninety-four".