1383427991 has 4 divisors (see below), whose sum is σ = 1509194184. Its totient is φ = 1257661800.

The previous prime is 1383427987. The next prime is 1383428009. The reversal of 1383427991 is 1997243831.

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 1383427991 - 2² = 1383427987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1383427961) 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 3 ways as a sum of consecutive naturals, for example, 62883080 + ... + 62883101.

It is an arithmetic number, because the mean of its divisors is an integer number (377298546).

Almost surely, 2^1383427991 is an apocalyptic number.

1383427991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1383427991 is a deficient number, since it is larger than the sum of its proper divisors (125766193).

1383427991 is a wasteful number, since it uses less digits than its factorization.

1383427991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125766192.

The product of its digits is 326592, while the sum is 47.

The square root of 1383427991 is about 37194.4618323750. The cubic root of 1383427991 is about 1114.2573807900.

The spelling of 1383427991 in words is "one billion, three hundred eighty-three million, four hundred twenty-seven thousand, nine hundred ninety-one".