123220400 has 30 divisors (see below), whose sum is σ = 296037972. Its totient is φ = 49288000.

The previous prime is 123220337. The next prime is 123220421. The reversal of 123220400 is 4022321.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 153626 + ... + 154425.

Almost surely, 2^123220400 is an apocalyptic number.

123220400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123220400 is an abundant number, since it is smaller than the sum of its proper divisors (172817572).

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

123220400 is a wasteful number, since it uses less digits than its factorization.

123220400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308069 (or 308058 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 123220400 is about 11100.4684585832. The cubic root of 123220400 is about 497.6158497242.

Adding to 123220400 its reverse (4022321), we get a palindrome (127242721).

The spelling of 123220400 in words is "one hundred twenty-three million, two hundred twenty thousand, four hundred".