1426991 has 2 divisors, whose sum is σ = 1426992. Its totient is φ = 1426990.

The previous prime is 1426987. The next prime is 1427017. The reversal of 1426991 is 1996241.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1426991 - 2² = 1426987 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1426951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 713495 + 713496.

It is an arithmetic number, because the mean of its divisors is an integer number (713496).

2^1426991 is an apocalyptic number.

1426991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1426991 is an equidigital number, since it uses as much as digits as its factorization.

1426991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 32.

The square root of 1426991 is about 1194.5672856729. The cubic root of 1426991 is about 112.5832404516.

The spelling of 1426991 in words is "one million, four hundred twenty-six thousand, nine hundred ninety-one".