991410838 has 24 divisors (see below), whose sum is σ = 1672630344. Its totient is φ = 440156640.

The previous prime is 991410793. The next prime is 991410839. The reversal of 991410838 is 838014199.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a junction number, because it is equal to n+sod(n) for n = 991410794 and 991410803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991410839) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37231 + ... + 58042.

It is an arithmetic number, because the mean of its divisors is an integer number (69692931).

Almost surely, 2^991410838 is an apocalyptic number.

991410838 is a deficient number, since it is larger than the sum of its proper divisors (681219506).

991410838 is a wasteful number, since it uses less digits than its factorization.

991410838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95340 (or 95329 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 991410838 is about 31486.6771508205. The cubic root of 991410838 is about 997.1287095819.

The spelling of 991410838 in words is "nine hundred ninety-one million, four hundred ten thousand, eight hundred thirty-eight".