1217213387 has 8 divisors (see below), whose sum is σ = 1312345440. Its totient is φ = 1122295680.

The previous prime is 1217213381. The next prime is 1217213399. The reversal of 1217213387 is 7833127121.

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

It is a cyclic number.

It is not a de Polignac number, because 1217213387 - 2¹² = 1217209291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1217213381) 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, 41687 + ... + 64592.

It is an arithmetic number, because the mean of its divisors is an integer number (164043180).

Almost surely, 2^1217213387 is an apocalyptic number.

1217213387 is a deficient number, since it is larger than the sum of its proper divisors (95132053).

1217213387 is a wasteful number, since it uses less digits than its factorization.

1217213387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107173.

The product of its digits is 14112, while the sum is 35.

The square root of 1217213387 is about 34888.5853396208. The cubic root of 1217213387 is about 1067.7155638220.

The spelling of 1217213387 in words is "one billion, two hundred seventeen million, two hundred thirteen thousand, three hundred eighty-seven".