1290788923 has 2 divisors, whose sum is σ = 1290788924. Its totient is φ = 1290788922.

The previous prime is 1290788909. The next prime is 1290788951. The reversal of 1290788923 is 3298870921.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1290788923 is a prime.

It is a super-2 number, since 2×1290788923² = 3332272087478999858, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1290782923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645394461 + 645394462.

It is an arithmetic number, because the mean of its divisors is an integer number (645394462).

Almost surely, 2^1290788923 is an apocalyptic number.

1290788923 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290788923 is an equidigital number, since it uses as much as digits as its factorization.

1290788923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 1290788923 is about 35927.5510298155. The cubic root of 1290788923 is about 1088.8091033474.

The spelling of 1290788923 in words is "one billion, two hundred ninety million, seven hundred eighty-eight thousand, nine hundred twenty-three".