981387 has 24 divisors (see below), whose sum is σ = 1617408. Its totient is φ = 567600.

The previous prime is 981377. The next prime is 981391. The reversal of 981387 is 783189.

It is not a de Polignac number, because 981387 - 2¹⁰ = 980363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (981377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2062 + ... + 2492.

It is an arithmetic number, because the mean of its divisors is an integer number (67392).

2⁹⁸¹³⁸⁷ is an apocalyptic number.

981387 is a deficient number, since it is larger than the sum of its proper divisors (636021).

981387 is a wasteful number, since it uses less digits than its factorization.

981387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471 (or 468 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 981387 is about 990.6497867561. The cubic root of 981387 is about 99.3756769860.

It can be divided in two parts, 98 and 1387, that added together give a triangular number (1485 = T₅₄).

The spelling of 981387 in words is "nine hundred eighty-one thousand, three hundred eighty-seven".