123249620 has 24 divisors (see below), whose sum is σ = 278734344. Its totient is φ = 45507456.

The previous prime is 123249619. The next prime is 123249631. The reversal of 123249620 is 26942321.

It can be written as a sum of positive squares in 4 ways, for example, as 14714896 + 108534724 = 3836^2 + 10418^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236759 + ... + 237278.

It is an arithmetic number, because the mean of its divisors is an integer number (11613931).

Almost surely, 2^123249620 is an apocalyptic number.

123249620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123249620 is an abundant number, since it is smaller than the sum of its proper divisors (155484724).

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

123249620 is a wasteful number, since it uses less digits than its factorization.

123249620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474059 (or 474057 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 123249620 is about 11101.7845412348. The cubic root of 123249620 is about 497.6551808358.

The spelling of 123249620 in words is "one hundred twenty-three million, two hundred forty-nine thousand, six hundred twenty".