1228387981 has 8 divisors (see below), whose sum is σ = 1296773280. Its totient is φ = 1160376048.

The previous prime is 1228387973. The next prime is 1228388011. The reversal of 1228387981 is 1897838221.

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 1228387981 - 2³ = 1228387973 is a prime.

It is a super-2 number, since 2×1228387981² = 3017874063730512722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228397981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86566 + ... + 99751.

It is an arithmetic number, because the mean of its divisors is an integer number (162096660).

Almost surely, 2^1228387981 is an apocalyptic number.

It is an amenable number.

1228387981 is a deficient number, since it is larger than the sum of its proper divisors (68385299).

1228387981 is a wasteful number, since it uses less digits than its factorization.

1228387981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186683.

The product of its digits is 387072, while the sum is 49.

The square root of 1228387981 is about 35048.3663100008. The cubic root of 1228387981 is about 1070.9729936002.

The spelling of 1228387981 in words is "one billion, two hundred twenty-eight million, three hundred eighty-seven thousand, nine hundred eighty-one".