623857 has 8 divisors (see below), whose sum is σ = 690536. Its totient is φ = 559872.

The previous prime is 623851. The next prime is 623867. The reversal of 623857 is 758326.

623857 is an esthetic number in base 6, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in 4 ways, for example, as 314721 + 309136 = 561^2 + 556^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 7-Lehmer number, since φ(623857) divides (623857-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 623857 - 2⁷ = 623729 is a prime.

It is a Duffinian number.

623857 is an undulating number in base 6.

It is not an unprimeable number, because it can be changed into a prime (623851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168 + ... + 1129.

It is an arithmetic number, because the mean of its divisors is an integer number (86317).

2⁶²³⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

623857 is a deficient number, since it is larger than the sum of its proper divisors (66679).

623857 is a wasteful number, since it uses less digits than its factorization.

623857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347.

The product of its digits is 10080, while the sum is 31.

The square root of 623857 is about 789.8461875581. The cubic root of 623857 is about 85.4466454623.

The spelling of 623857 in words is "six hundred twenty-three thousand, eight hundred fifty-seven".