123542550 has 48 divisors (see below), whose sum is σ = 340432080. Its totient is φ = 32944320.

The previous prime is 123542543. The next prime is 123542557. The reversal of 123542550 is 55245321.

It is a happy number.

123542550 is a `hidden beast` number, since 1 + 235 + 425 + 5 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (123542543) and next prime (123542557).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123542557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44407 + ... + 47106.

It is an arithmetic number, because the mean of its divisors is an integer number (7092335).

Almost surely, 2^123542550 is an apocalyptic number.

123542550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123542550 is an abundant number, since it is smaller than the sum of its proper divisors (216889530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123542550 is a wasteful number, since it uses less digits than its factorization.

123542550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91534 (or 91523 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 123542550 is about 11114.9696355861. The cubic root of 123542550 is about 498.0491314569.

Adding to 123542550 its reverse (55245321), we get a palindrome (178787871).

The spelling of 123542550 in words is "one hundred twenty-three million, five hundred forty-two thousand, five hundred fifty".