1212540393 has 4 divisors (see below), whose sum is σ = 1616720528. Its totient is φ = 808360260.

The previous prime is 1212540379. The next prime is 1212540397. The reversal of 1212540393 is 3930452121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1212540393 - 2⁴ = 1212540377 is a prime.

It is a super-3 number, since 3×1212540393³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212540393.

It is not an unprimeable number, because it can be changed into a prime (1212540397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202090063 + ... + 202090068.

It is an arithmetic number, because the mean of its divisors is an integer number (404180132).

Almost surely, 2^1212540393 is an apocalyptic number.

It is an amenable number.

1212540393 is a deficient number, since it is larger than the sum of its proper divisors (404180135).

1212540393 is an equidigital number, since it uses as much as digits as its factorization.

1212540393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404180134.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 1212540393 is about 34821.5506978078. The cubic root of 1212540393 is about 1066.3474588571.

The spelling of 1212540393 in words is "one billion, two hundred twelve million, five hundred forty thousand, three hundred ninety-three".