857009623 has 2 divisors, whose sum is σ = 857009624. Its totient is φ = 857009622.

The previous prime is 857009579. The next prime is 857009677. The reversal of 857009623 is 326900758.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 857009623 - 2²⁹ = 320138711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857009683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428504811 + 428504812.

It is an arithmetic number, because the mean of its divisors is an integer number (428504812).

Almost surely, 2^857009623 is an apocalyptic number.

857009623 is a deficient number, since it is larger than the sum of its proper divisors (1).

857009623 is an equidigital number, since it uses as much as digits as its factorization.

857009623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 857009623 is about 29274.7266938566. The cubic root of 857009623 is about 949.8650308716.

The spelling of 857009623 in words is "eight hundred fifty-seven million, nine thousand, six hundred twenty-three".