1290427 has 2 divisors, whose sum is σ = 1290428. Its totient is φ = 1290426.

The previous prime is 1290379. The next prime is 1290431. The reversal of 1290427 is 7240921.

It is a strong prime.

It is an emirp because it is prime and its reverse (7240921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1290427 - 2⁷ = 1290299 is a prime.

It is not a weakly prime, because it can be changed into another prime (1290467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645213 + 645214.

It is an arithmetic number, because the mean of its divisors is an integer number (645214).

2^1290427 is an apocalyptic number.

1290427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290427 is an equidigital number, since it uses as much as digits as its factorization.

1290427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 1290427 is about 1135.9696298757. The cubic root of 1290427 is about 108.8707330474.

The spelling of 1290427 in words is "one million, two hundred ninety thousand, four hundred twenty-seven".