911891940 has 24 divisors (see below), whose sum is σ = 2553297600. Its totient is φ = 243171168.

The previous prime is 911891831. The next prime is 911891941. The reversal of 911891940 is 49198119.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 911891892 and 911891901.

It is not an unprimeable number, because it can be changed into a prime (911891941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7599040 + ... + 7599159.

It is an arithmetic number, because the mean of its divisors is an integer number (106387400).

Almost surely, 2^911891940 is an apocalyptic number.

It is an amenable number.

911891940 is an abundant number, since it is smaller than the sum of its proper divisors (1641405660).

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

911891940 is a wasteful number, since it uses less digits than its factorization.

911891940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15198211 (or 15198209 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 42.

The square root of 911891940 is about 30197.5485760020. The cubic root of 911891940 is about 969.7232143286.

The spelling of 911891940 in words is "nine hundred eleven million, eight hundred ninety-one thousand, nine hundred forty".