121638826 has 4 divisors (see below), whose sum is σ = 182458242. Its totient is φ = 60819412.

The previous prime is 121638809. The next prime is 121638827. The reversal of 121638826 is 628836121.

It is a happy number.

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., 62425801 + 59213025 = 7901^2 + 7695^2 .

It is not an unprimeable number, because it can be changed into a prime (121638827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30409705 + ... + 30409708.

Almost surely, 2^121638826 is an apocalyptic number.

121638826 is a deficient number, since it is larger than the sum of its proper divisors (60819416).

121638826 is an equidigital number, since it uses as much as digits as its factorization.

121638826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60819415.

The product of its digits is 27648, while the sum is 37.

The square root of 121638826 is about 11028.9993199746. Note that the first 3 decimals coincide. The cubic root of 121638826 is about 495.4776547729.

The spelling of 121638826 in words is "one hundred twenty-one million, six hundred thirty-eight thousand, eight hundred twenty-six".