816457 has 4 divisors (see below), whose sum is σ = 822016. Its totient is φ = 810900.

The previous prime is 816451. The next prime is 816469. The reversal of 816457 is 754618.

816457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 816457 - 2⁷ = 816329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2553 + ... + 2854.

It is an arithmetic number, because the mean of its divisors is an integer number (205504).

2⁸¹⁶⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

816457 is a deficient number, since it is larger than the sum of its proper divisors (5559).

816457 is a wasteful number, since it uses less digits than its factorization.

816457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5558.

The product of its digits is 6720, while the sum is 31.

The square root of 816457 is about 903.5801015959. The cubic root of 816457 is about 93.4640161989.

The spelling of 816457 in words is "eight hundred sixteen thousand, four hundred fifty-seven".