978417 has 12 divisors (see below), whose sum is σ = 1541904. Its totient is φ = 592920.

The previous prime is 978413. The next prime is 978427. The reversal of 978417 is 714879.

It is not a de Polignac number, because 978417 - 2² = 978413 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 978417.

It is not an unprimeable number, because it can be changed into a prime (978413) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4843 + ... + 5040.

It is an arithmetic number, because the mean of its divisors is an integer number (128492).

2⁹⁷⁸⁴¹⁷ is an apocalyptic number.

It is an amenable number.

978417 is a deficient number, since it is larger than the sum of its proper divisors (563487).

978417 is a wasteful number, since it uses less digits than its factorization.

978417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9900 (or 9897 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 978417 is about 989.1496347874. The cubic root of 978417 is about 99.2753278549.

It can be divided in two parts, 9784 and 17, that added together give a square (9801 = 99²).

The spelling of 978417 in words is "nine hundred seventy-eight thousand, four hundred seventeen".