1212393388 has 48 divisors (see below), whose sum is σ = 2271919104. Its totient is φ = 564776960.

The previous prime is 1212393379. The next prime is 1212393389. The reversal of 1212393388 is 8833932121.

It is a super-2 number, since 2×1212393388² = 2939795454532237088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1212393388.

It is not an unprimeable number, because it can be changed into a prime (1212393389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1110723 + ... + 1111813.

It is an arithmetic number, because the mean of its divisors is an integer number (47331648).

Almost surely, 2^1212393388 is an apocalyptic number.

It is an amenable number.

1212393388 is a deficient number, since it is larger than the sum of its proper divisors (1059525716).

1212393388 is a wasteful number, since it uses less digits than its factorization.

1212393388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1422 (or 1420 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The square root of 1212393388 is about 34819.4398002036. The cubic root of 1212393388 is about 1066.3043634560.

The spelling of 1212393388 in words is "one billion, two hundred twelve million, three hundred ninety-three thousand, three hundred eighty-eight".