1212123400 has 48 divisors (see below), whose sum is σ = 2820483540. Its totient is φ = 484454400.

The previous prime is 1212123389. The next prime is 1212123439. The reversal of 1212123400 is 43212121.

It can be written as a sum of positive squares in 6 ways, for example, as 589421284 + 622702116 = 24278^2 + 24954^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 454872 + ... + 457528.

Almost surely, 2^1212123400 is an apocalyptic number.

1212123400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212123400 is an abundant number, since it is smaller than the sum of its proper divisors (1608360140).

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

1212123400 is a wasteful number, since it uses less digits than its factorization.

1212123400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4954 (or 4945 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1212123400 is about 34815.5626121423. The cubic root of 1212123400 is about 1066.2252057728.

Adding to 1212123400 its reverse (43212121), we get a palindrome (1255335521).

The spelling of 1212123400 in words is "one billion, two hundred twelve million, one hundred twenty-three thousand, four hundred".