1240726666 has 32 divisors (see below), whose sum is σ = 1934141328. Its totient is φ = 596520960.

The previous prime is 1240726621. The next prime is 1240726673. The reversal of 1240726666 is 6666270421.

It can be written as a sum of positive squares in 8 ways, for example, as 463153441 + 777573225 = 21521^2 + 27885^2 .

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, 2714710 + ... + 2715166.

Almost surely, 2^1240726666 is an apocalyptic number.

1240726666 is a deficient number, since it is larger than the sum of its proper divisors (693414662).

1240726666 is a wasteful number, since it uses less digits than its factorization.

1240726666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906.

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 1240726666 is about 35223.9501759811. The cubic root of 1240726666 is about 1074.5468913579.

The spelling of 1240726666 in words is "one billion, two hundred forty million, seven hundred twenty-six thousand, six hundred sixty-six".