208428493 has 8 divisors (see below), whose sum is σ = 256527488. Its totient is φ = 164910384.

The previous prime is 208428487. The next prime is 208428509. The reversal of 208428493 is 394824802.

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

It is a cyclic number.

It is not a de Polignac number, because 208428493 - 2¹³ = 208420301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208428193) 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, 1145121 + ... + 1145302.

It is an arithmetic number, because the mean of its divisors is an integer number (32065936).

Almost surely, 2^208428493 is an apocalyptic number.

It is an amenable number.

208428493 is a deficient number, since it is larger than the sum of its proper divisors (48098995).

208428493 is a wasteful number, since it uses less digits than its factorization.

208428493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2290443.

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 208428493 is about 14437.0527809522. The cubic root of 208428493 is about 592.9057964177.

The spelling of 208428493 in words is "two hundred eight million, four hundred twenty-eight thousand, four hundred ninety-three".