1240312666 has 16 divisors (see below), whose sum is σ = 2021564160. Its totient is φ = 568563840.

The previous prime is 1240312627. The next prime is 1240312669. The reversal of 1240312666 is 6662130421.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (1240312669) 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, 525271 + ... + 527626.

It is an arithmetic number, because the mean of its divisors is an integer number (126347760).

Almost surely, 2^1240312666 is an apocalyptic number.

1240312666 is a deficient number, since it is larger than the sum of its proper divisors (781251494).

1240312666 is a wasteful number, since it uses less digits than its factorization.

1240312666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052949.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 1240312666 is about 35218.0730023663. The cubic root of 1240312666 is about 1074.4273614313.

The spelling of 1240312666 in words is "one billion, two hundred forty million, three hundred twelve thousand, six hundred sixty-six".