123215542 has 4 divisors (see below), whose sum is σ = 184823316. Its totient is φ = 61607770.

The previous prime is 123215509. The next prime is 123215549. The reversal of 123215542 is 245512321.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123215549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30803884 + ... + 30803887.

It is an arithmetic number, because the mean of its divisors is an integer number (46205829).

Almost surely, 2^123215542 is an apocalyptic number.

123215542 is a deficient number, since it is larger than the sum of its proper divisors (61607774).

123215542 is an equidigital number, since it uses as much as digits as its factorization.

123215542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61607773.

The product of its digits is 2400, while the sum is 25.

The square root of 123215542 is about 11100.2496368325. The cubic root of 123215542 is about 497.6093100885.

Adding to 123215542 its reverse (245512321), we get a palindrome (368727863).

The spelling of 123215542 in words is "one hundred twenty-three million, two hundred fifteen thousand, five hundred forty-two".