1217982399 has 8 divisors (see below), whose sum is σ = 1626822912. Its totient is φ = 810565080.

The previous prime is 1217982383. The next prime is 1217982401. The reversal of 1217982399 is 9932897121.

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

It is not a de Polignac number, because 1217982399 - 2⁴ = 1217982383 is a prime.

It is a super-2 number, since 2×1217982399² = 2966962248547590402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217982329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353799 + ... + 357224.

It is an arithmetic number, because the mean of its divisors is an integer number (203352864).

Almost surely, 2^1217982399 is an apocalyptic number.

1217982399 is a deficient number, since it is larger than the sum of its proper divisors (408840513).

1217982399 is an equidigital number, since it uses as much as digits as its factorization.

1217982399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711597.

The product of its digits is 489888, while the sum is 51.

The square root of 1217982399 is about 34899.6045679604. The cubic root of 1217982399 is about 1067.9403705363.

The spelling of 1217982399 in words is "one billion, two hundred seventeen million, nine hundred eighty-two thousand, three hundred ninety-nine".