1240780386 has 32 divisors (see below), whose sum is σ = 2514758400. Its totient is φ = 408097040.

The previous prime is 1240780349. The next prime is 1240780423. The reversal of 1240780386 is 6830870421.

1240780386 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1240780349) and next prime (1240780423).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136285 + ... + 145103.

It is an arithmetic number, because the mean of its divisors is an integer number (78586200).

Almost surely, 2^1240780386 is an apocalyptic number.

1240780386 is an abundant number, since it is smaller than the sum of its proper divisors (1273978014).

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

1240780386 is a wasteful number, since it uses less digits than its factorization.

1240780386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9134.

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 1240780386 is about 35224.7127170684. The cubic root of 1240780386 is about 1074.5623994274.

The spelling of 1240780386 in words is "one billion, two hundred forty million, seven hundred eighty thousand, three hundred eighty-six".