634121826 has 64 divisors (see below), whose sum is σ = 1416562560. Its totient is φ = 187983360.

The previous prime is 634121821. The next prime is 634121837. The reversal of 634121826 is 628121436.

It is a super-2 number, since 2×634121826² = 804220980419148552, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (634121821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 264240 + ... + 266628.

It is an arithmetic number, because the mean of its divisors is an integer number (22133790).

Almost surely, 2^634121826 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 634121826, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (708281280).

634121826 is an abundant number, since it is smaller than the sum of its proper divisors (782440734).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

634121826 is a wasteful number, since it uses less digits than its factorization.

634121826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2531.

The product of its digits is 13824, while the sum is 33.

The square root of 634121826 is about 25181.7756721006. The cubic root of 634121826 is about 859.1273941530.

The spelling of 634121826 in words is "six hundred thirty-four million, one hundred twenty-one thousand, eight hundred twenty-six".