123261556 has 24 divisors (see below), whose sum is σ = 235642176. Its totient is φ = 55950720.

The previous prime is 123261547. The next prime is 123261559. The reversal of 123261556 is 655162321.

It is a super-2 number, since 2×123261556² = 30386822375082272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123261559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41100 + ... + 43996.

It is an arithmetic number, because the mean of its divisors is an integer number (9818424).

Almost surely, 2^123261556 is an apocalyptic number.

It is an amenable number.

123261556 is a deficient number, since it is larger than the sum of its proper divisors (112380620).

123261556 is a wasteful number, since it uses less digits than its factorization.

123261556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3879 (or 3877 counting only the distinct ones).

The product of its digits is 10800, while the sum is 31.

The square root of 123261556 is about 11102.3220994529. The cubic root of 123261556 is about 497.6712453086.

The spelling of 123261556 in words is "one hundred twenty-three million, two hundred sixty-one thousand, five hundred fifty-six".