1290261866 has 16 divisors (see below), whose sum is σ = 2021419584. Its totient is φ = 616507584.

The previous prime is 1290261829. The next prime is 1290261877. The reversal of 1290261866 is 6681620921.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39170 + ... + 64146.

It is an arithmetic number, because the mean of its divisors is an integer number (126338724).

Almost surely, 2^1290261866 is an apocalyptic number.

1290261866 is a deficient number, since it is larger than the sum of its proper divisors (731157718).

1290261866 is a wasteful number, since it uses less digits than its factorization.

1290261866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26125.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 1290261866 is about 35920.2152833192. The cubic root of 1290261866 is about 1088.6608884136.

The spelling of 1290261866 in words is "one billion, two hundred ninety million, two hundred sixty-one thousand, eight hundred sixty-six".