1212123399 has 8 divisors (see below), whose sum is σ = 1616540400. Its totient is φ = 807894336.

The previous prime is 1212123389. The next prime is 1212123439. The reversal of 1212123399 is 9933212121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1212123399 - 2⁴ = 1212123383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212123329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31174 + ... + 58275.

It is an arithmetic number, because the mean of its divisors is an integer number (202067550).

Almost surely, 2^1212123399 is an apocalyptic number.

1212123399 is a deficient number, since it is larger than the sum of its proper divisors (404417001).

1212123399 is an equidigital number, since it uses as much as digits as its factorization.

1212123399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93969.

The product of its digits is 5832, while the sum is 33.

The square root of 1212123399 is about 34815.5625977809. The cubic root of 1212123399 is about 1066.2252054796.

The spelling of 1212123399 in words is "one billion, two hundred twelve million, one hundred twenty-three thousand, three hundred ninety-nine".