634220427 has 4 divisors (see below), whose sum is σ = 845627240. Its totient is φ = 422813616.

The previous prime is 634220417. The next prime is 634220471. The reversal of 634220427 is 724022436.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 634220427 - 2⁷ = 634220299 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 634220394 and 634220403.

It is not an unprimeable number, because it can be changed into a prime (634220417) 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, 105703402 + ... + 105703407.

It is an arithmetic number, because the mean of its divisors is an integer number (211406810).

Almost surely, 2^634220427 is an apocalyptic number.

634220427 is a deficient number, since it is larger than the sum of its proper divisors (211406813).

634220427 is a wasteful number, since it uses less digits than its factorization.

634220427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211406812.

The product of its (nonzero) digits is 16128, while the sum is 30.

The square root of 634220427 is about 25183.7333808949. The cubic root of 634220427 is about 859.1719210491.

The spelling of 634220427 in words is "six hundred thirty-four million, two hundred twenty thousand, four hundred twenty-seven".