978742 has 8 divisors (see below), whose sum is σ = 1532016. Its totient is φ = 468072.

The previous prime is 978727. The next prime is 978743. The reversal of 978742 is 247879.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978743) by changing a digit.

978742 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10593 + ... + 10684.

It is an arithmetic number, because the mean of its divisors is an integer number (191502).

2⁹⁷⁸⁷⁴² is an apocalyptic number.

978742 is a deficient number, since it is larger than the sum of its proper divisors (553274).

978742 is a wasteful number, since it uses less digits than its factorization.

978742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21302.

The product of its digits is 28224, while the sum is 37.

The square root of 978742 is about 989.3139036726. The cubic root of 978742 is about 99.2863187070.

The spelling of 978742 in words is "nine hundred seventy-eight thousand, seven hundred forty-two".