991418 has 16 divisors (see below), whose sum is σ = 1555200. Its totient is φ = 473616.

The previous prime is 991409. The next prime is 991427. The reversal of 991418 is 814199.

991418 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (991409) and next prime (991427).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4883 + ... + 5081.

It is an arithmetic number, because the mean of its divisors is an integer number (97200).

2⁹⁹¹⁴¹⁸ is an apocalyptic number.

991418 is a deficient number, since it is larger than the sum of its proper divisors (563782).

991418 is a wasteful number, since it uses less digits than its factorization.

991418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301.

The product of its digits is 2592, while the sum is 32.

The square root of 991418 is about 995.6997539419. The cubic root of 991418 is about 99.7131110678.

The spelling of 991418 in words is "nine hundred ninety-one thousand, four hundred eighteen".