1213898387 has 4 divisors (see below), whose sum is σ = 1307275200. Its totient is φ = 1120521576.

The previous prime is 1213898377. The next prime is 1213898407. The reversal of 1213898387 is 7838983121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1213898387 - 2¹² = 1213894291 is a prime.

It is a super-3 number, since 3×1213898387³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213898377) 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, 46688387 + ... + 46688412.

It is an arithmetic number, because the mean of its divisors is an integer number (326818800).

Almost surely, 2^1213898387 is an apocalyptic number.

1213898387 is a deficient number, since it is larger than the sum of its proper divisors (93376813).

1213898387 is an equidigital number, since it uses as much as digits as its factorization.

1213898387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93376812.

The product of its digits is 580608, while the sum is 50.

The square root of 1213898387 is about 34841.0445738930. The cubic root of 1213898387 is about 1066.7453983661.

The spelling of 1213898387 in words is "one billion, two hundred thirteen million, eight hundred ninety-eight thousand, three hundred eighty-seven".