123891542 has 4 divisors (see below), whose sum is σ = 185837316. Its totient is φ = 61945770.

The previous prime is 123891541. The next prime is 123891553. The reversal of 123891542 is 245198321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 245198321 = 9011 ⋅27211.

It is a super-2 number, since 2×123891542² = 30698228358275528, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123891541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30972884 + ... + 30972887.

It is an arithmetic number, because the mean of its divisors is an integer number (46459329).

Almost surely, 2^123891542 is an apocalyptic number.

123891542 is a deficient number, since it is larger than the sum of its proper divisors (61945774).

123891542 is an equidigital number, since it uses as much as digits as its factorization.

123891542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61945773.

The product of its digits is 17280, while the sum is 35.

The square root of 123891542 is about 11130.6577523523. The cubic root of 123891542 is about 498.5176657130.

It can be divided in two parts, 12389 and 1542, that added together give a palindrome (13931).

The spelling of 123891542 in words is "one hundred twenty-three million, eight hundred ninety-one thousand, five hundred forty-two".