978387 has 8 divisors (see below), whose sum is σ = 1317840. Its totient is φ = 645600.

The previous prime is 978359. The next prime is 978389. The reversal of 978387 is 783879.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 978387 - 2⁶ = 978323 is a prime.

It is a super-2 number, since 2×978387² = 1914482243538, which contains 22 as substring.

It is a nialpdrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 978387.

It is not an unprimeable number, because it can be changed into a prime (978389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1312 + ... + 1917.

It is an arithmetic number, because the mean of its divisors is an integer number (164730).

2⁹⁷⁸³⁸⁷ is an apocalyptic number.

978387 is a deficient number, since it is larger than the sum of its proper divisors (339453).

978387 is a wasteful number, since it uses less digits than its factorization.

978387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333.

The product of its digits is 84672, while the sum is 42.

The square root of 978387 is about 989.1344701303. The cubic root of 978387 is about 99.2743131920.

It can be divided in two parts, 9783 and 87, that added together give a triangular number (9870 = T₁₄₀).

The spelling of 978387 in words is "nine hundred seventy-eight thousand, three hundred eighty-seven".