991301240 has 32 divisors (see below), whose sum is σ = 2266997760. Its totient is φ = 390019200.

The previous prime is 991301221. The next prime is 991301249. The reversal of 991301240 is 42103199.

It is a happy number.

991301240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991301249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200696 + ... + 205575.

It is an arithmetic number, because the mean of its divisors is an integer number (70843680).

Almost surely, 2^991301240 is an apocalyptic number.

It is an amenable number.

991301240 is an abundant number, since it is smaller than the sum of its proper divisors (1275696520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

991301240 is a wasteful number, since it uses less digits than its factorization.

991301240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406343 (or 406339 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 991301240 is about 31484.9367158329. The cubic root of 991301240 is about 997.0919648624.

The spelling of 991301240 in words is "nine hundred ninety-one million, three hundred one thousand, two hundred forty".