1240847865 has 24 divisors (see below), whose sum is σ = 2178034560. Its totient is φ = 653406624.

The previous prime is 1240847849. The next prime is 1240847887. The reversal of 1240847865 is 5687480421.

It is not a de Polignac number, because 1240847865 - 2⁴ = 1240847849 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1240847865.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 170967 + ... + 178076.

It is an arithmetic number, because the mean of its divisors is an integer number (90751440).

Almost surely, 2^1240847865 is an apocalyptic number.

1240847865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1240847865 is a deficient number, since it is larger than the sum of its proper divisors (937186695).

1240847865 is a wasteful number, since it uses less digits than its factorization.

1240847865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349133 (or 349130 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The square root of 1240847865 is about 35225.6705401047. The cubic root of 1240847865 is about 1074.5818788568.

The spelling of 1240847865 in words is "one billion, two hundred forty million, eight hundred forty-seven thousand, eight hundred sixty-five".