1280623 has 2 divisors, whose sum is σ = 1280624. Its totient is φ = 1280622.

The previous prime is 1280603. The next prime is 1280633. The reversal of 1280623 is 3260821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1280623 is a prime.

1280623 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1280594 and 1280603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1280603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640311 + 640312.

It is an arithmetic number, because the mean of its divisors is an integer number (640312).

2^1280623 is an apocalyptic number.

1280623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280623 is an equidigital number, since it uses as much as digits as its factorization.

1280623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1280623 is about 1131.6461461075. The cubic root of 1280623 is about 108.5943172460.

The spelling of 1280623 in words is "one million, two hundred eighty thousand, six hundred twenty-three".