978266394 has 96 divisors (see below), whose sum is σ = 2607261696. Its totient is φ = 258716160.

The previous prime is 978266381. The next prime is 978266407. The reversal of 978266394 is 493662879.

It is a happy number.

978266394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (978266381) and next prime (978266407).

It is a self number, because there is not a number n which added to its sum of digits gives 978266394.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 126919 + ... + 134405.

It is an arithmetic number, because the mean of its divisors is an integer number (27158976).

Almost surely, 2^978266394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 978266394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1303630848).

978266394 is an abundant number, since it is smaller than the sum of its proper divisors (1628995302).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

978266394 is a wasteful number, since it uses less digits than its factorization.

978266394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7580 (or 7577 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 978266394 is about 31277.2504226315. The cubic root of 978266394 is about 992.7023383489.

It can be divided in two parts, 9782 and 66394, that added together give a square (76176 = 276²).

The spelling of 978266394 in words is "nine hundred seventy-eight million, two hundred sixty-six thousand, three hundred ninety-four".