123220340 has 12 divisors (see below), whose sum is σ = 258762756. Its totient is φ = 49288128.

The previous prime is 123220337. The next prime is 123220421. The reversal of 123220340 is 43022321.

It can be written as a sum of positive squares in 2 ways, for example, as 19465744 + 103754596 = 4412^2 + 10186^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3080489 + ... + 3080528.

It is an arithmetic number, because the mean of its divisors is an integer number (21563563).

Almost surely, 2^123220340 is an apocalyptic number.

123220340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123220340 is an abundant number, since it is smaller than the sum of its proper divisors (135542416).

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

123220340 is a wasteful number, since it uses less digits than its factorization.

123220340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6161026 (or 6161024 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 123220340 is about 11100.4657559942. The cubic root of 123220340 is about 497.6157689557.

Adding to 123220340 its reverse (43022321), we get a palindrome (166242661).

The spelling of 123220340 in words is "one hundred twenty-three million, two hundred twenty thousand, three hundred forty".