426638207 has 8 divisors (see below), whose sum is σ = 433914096. Its totient is φ = 419401152.

The previous prime is 426638189. The next prime is 426638243. The reversal of 426638207 is 702836624.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-426638207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (426638507) 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, 12893 + ... + 31929.

It is an arithmetic number, because the mean of its divisors is an integer number (54239262).

Almost surely, 2^426638207 is an apocalyptic number.

426638207 is a deficient number, since it is larger than the sum of its proper divisors (7275889).

426638207 is a wasteful number, since it uses less digits than its factorization.

426638207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19417.

The product of its (nonzero) digits is 96768, while the sum is 38.

The square root of 426638207 is about 20655.2222694407. Note that the first 4 decimals coincide. The cubic root of 426638207 is about 752.8120842503.

The spelling of 426638207 in words is "four hundred twenty-six million, six hundred thirty-eight thousand, two hundred seven".