123213442 has 32 divisors (see below), whose sum is σ = 213192000. Its totient is φ = 52819200.

The previous prime is 123213439. The next prime is 123213449. The reversal of 123213442 is 244312321.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (123213449) 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 15 ways as a sum of consecutive naturals, for example, 116934 + ... + 117982.

It is an arithmetic number, because the mean of its divisors is an integer number (6662250).

Almost surely, 2^123213442 is an apocalyptic number.

123213442 is a deficient number, since it is larger than the sum of its proper divisors (89978558).

123213442 is a wasteful number, since it uses less digits than its factorization.

123213442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1362.

The product of its digits is 1152, while the sum is 22.

The square root of 123213442 is about 11100.1550439622. The cubic root of 123213442 is about 497.6064831034.

Adding to 123213442 its reverse (244312321), we get a palindrome (367525763).

The spelling of 123213442 in words is "one hundred twenty-three million, two hundred thirteen thousand, four hundred forty-two".