121643738 has 16 divisors (see below), whose sum is σ = 203368320. Its totient is φ = 54230976.

The previous prime is 121643737. The next prime is 121643747. The reversal of 121643738 is 837346121.

It is a super-2 number, since 2×121643738² = 29594397989225288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121643698 and 121643707.

It is not an unprimeable number, because it can be changed into a prime (121643737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93506 + ... + 94797.

It is an arithmetic number, because the mean of its divisors is an integer number (12710520).

Almost surely, 2^121643738 is an apocalyptic number.

121643738 is a deficient number, since it is larger than the sum of its proper divisors (81724582).

121643738 is a wasteful number, since it uses less digits than its factorization.

121643738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188341.

The product of its digits is 24192, while the sum is 35.

The square root of 121643738 is about 11029.2220033872. Note that the first 3 decimals coincide. The cubic root of 121643738 is about 495.4843241168.

Adding to 121643738 its reverse (837346121), we get a palindrome (958989859).

The spelling of 121643738 in words is "one hundred twenty-one million, six hundred forty-three thousand, seven hundred thirty-eight".