857407 has 2 divisors, whose sum is σ = 857408. Its totient is φ = 857406.

The previous prime is 857369. The next prime is 857411. The reversal of 857407 is 704758.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 857407 - 2¹¹ = 855359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428703 + 428704.

It is an arithmetic number, because the mean of its divisors is an integer number (428704).

2⁸⁵⁷⁴⁰⁷ is an apocalyptic number.

857407 is a deficient number, since it is larger than the sum of its proper divisors (1).

857407 is an equidigital number, since it uses as much as digits as its factorization.

857407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 857407 is about 925.9627422310. The cubic root of 857407 is about 95.0011818874.

The spelling of 857407 in words is "eight hundred fifty-seven thousand, four hundred seven".