2291305440 has 48 divisors (see below), whose sum is σ = 7217613648. Its totient is φ = 611014656.

The previous prime is 2291305427. The next prime is 2291305447. The reversal of 2291305440 is 445031922.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 2291305398 and 2291305407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2291305447) 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, 2386297 + ... + 2387256.

It is an arithmetic number, because the mean of its divisors is an integer number (150366951).

Almost surely, 2^2291305440 is an apocalyptic number.

2291305440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2291305440 is an abundant number, since it is smaller than the sum of its proper divisors (4926308208).

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

2291305440 is a wasteful number, since it uses less digits than its factorization.

2291305440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4773571 (or 4773563 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 2291305440 is about 47867.5823496445. The cubic root of 2291305440 is about 1318.3407066270.

The spelling of 2291305440 in words is "two billion, two hundred ninety-one million, three hundred five thousand, four hundred forty".