634938154 has 4 divisors (see below), whose sum is σ = 952407234. Its totient is φ = 317469076.

The previous prime is 634938133. The next prime is 634938169. The reversal of 634938154 is 451839436.

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

It can be written as a sum of positive squares in only one way, i.e., 546484129 + 88454025 = 23377^2 + 9405^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 634938154.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158734537 + ... + 158734540.

Almost surely, 2^634938154 is an apocalyptic number.

634938154 is a deficient number, since it is larger than the sum of its proper divisors (317469080).

634938154 is a wasteful number, since it uses less digits than its factorization.

634938154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317469079.

The product of its digits is 311040, while the sum is 43.

The square root of 634938154 is about 25197.9791650045. The cubic root of 634938154 is about 859.4958980086.

The spelling of 634938154 in words is "six hundred thirty-four million, nine hundred thirty-eight thousand, one hundred fifty-four".