1383856987 has 4 divisors (see below), whose sum is σ = 1383931576. Its totient is φ = 1383782400.

The previous prime is 1383856951. The next prime is 1383856993. The reversal of 1383856987 is 7896583831.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7896583831 = 25939 ⋅304429.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1383856987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1383856907) 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, 14683 + ... + 54619.

It is an arithmetic number, because the mean of its divisors is an integer number (345982894).

Almost surely, 2^1383856987 is an apocalyptic number.

1383856987 is a deficient number, since it is larger than the sum of its proper divisors (74589).

1383856987 is an equidigital number, since it uses as much as digits as its factorization.

1383856987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74588.

The product of its digits is 8709120, while the sum is 58.

The square root of 1383856987 is about 37200.2283191918. The cubic root of 1383856987 is about 1114.3725446104.

The spelling of 1383856987 in words is "one billion, three hundred eighty-three million, eight hundred fifty-six thousand, nine hundred eighty-seven".