1638829122 has 64 divisors (see below), whose sum is σ = 3890121984. Its totient is φ = 450524160.

The previous prime is 1638829099. The next prime is 1638829133. The reversal of 1638829122 is 2219288361.

It is a super-2 number, since 2×1638829122² = 5371521782230581768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 119188 + ... + 132224.

It is an arithmetic number, because the mean of its divisors is an integer number (60783156).

Almost surely, 2^1638829122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1638829122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1945060992).

1638829122 is an abundant number, since it is smaller than the sum of its proper divisors (2251292862).

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

1638829122 is a wasteful number, since it uses less digits than its factorization.

1638829122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13163.

The product of its digits is 82944, while the sum is 42.

The square root of 1638829122 is about 40482.4544957442. The cubic root of 1638829122 is about 1178.9929936902.

The spelling of 1638829122 in words is "one billion, six hundred thirty-eight million, eight hundred twenty-nine thousand, one hundred twenty-two".