206403457 has 4 divisors (see below), whose sum is σ = 222280660. Its totient is φ = 190526256.

The previous prime is 206403437. The next prime is 206403467. The reversal of 206403457 is 754304602.

206403457 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.

It can be written as a sum of positive squares in 2 ways, for example, as 33454656 + 172948801 = 5784^2 + 13151^2 .

It is a cyclic number.

It is not a de Polignac number, because 206403457 - 2¹¹ = 206401409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206403437) 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, 7938582 + ... + 7938607.

It is an arithmetic number, because the mean of its divisors is an integer number (55570165).

Almost surely, 2^206403457 is an apocalyptic number.

It is an amenable number.

206403457 is a deficient number, since it is larger than the sum of its proper divisors (15877203).

206403457 is a wasteful number, since it uses less digits than its factorization.

206403457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15877202.

The product of its (nonzero) digits is 20160, while the sum is 31.

The square root of 206403457 is about 14366.7483098995. The cubic root of 206403457 is about 590.9793721441.

The spelling of 206403457 in words is "two hundred six million, four hundred three thousand, four hundred fifty-seven".