123011172 has 36 divisors (see below), whose sum is σ = 314446860. Its totient is φ = 40541952.

The previous prime is 123011171. The next prime is 123011177. The reversal of 123011172 is 271110321.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 30735936 + 92275236 = 5544^2 + 9606^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (123011171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15993 + ... + 22400.

It is an arithmetic number, because the mean of its divisors is an integer number (8734635).

Almost surely, 2^123011172 is an apocalyptic number.

123011172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

123011172 is an abundant number, since it is smaller than the sum of its proper divisors (191435688).

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

123011172 is a wasteful number, since it uses less digits than its factorization.

123011172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38492 (or 38487 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 123011172 is about 11091.0401676308. The cubic root of 123011172 is about 497.3340399108.

Adding to 123011172 its reverse (271110321), we get a palindrome (394121493).

The spelling of 123011172 in words is "one hundred twenty-three million, eleven thousand, one hundred seventy-two".