123740220 has 96 divisors (see below), whose sum is σ = 363073536. Its totient is φ = 31449600.

The previous prime is 123740209. The next prime is 123740249. The reversal of 123740220 is 22047321.

123740220 = 1285² + 1286² + ... + 1355².

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131592 + ... + 132528.

It is an arithmetic number, because the mean of its divisors is an integer number (3782016).

Almost surely, 2^123740220 is an apocalyptic number.

123740220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123740220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181536768).

123740220 is an abundant number, since it is smaller than the sum of its proper divisors (239333316).

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

123740220 is a wasteful number, since it uses less digits than its factorization.

123740220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051 (or 1049 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 123740220 is about 11123.8581436478. The cubic root of 123740220 is about 498.3146186962.

Adding to 123740220 its reverse (22047321), we get a palindrome (145787541).

The spelling of 123740220 in words is "one hundred twenty-three million, seven hundred forty thousand, two hundred twenty".