9978442 has 4 divisors (see below), whose sum is σ = 14967666. Its totient is φ = 4989220.

The previous prime is 9978431. The next prime is 9978461. The reversal of 9978442 is 2448799.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 8071281 + 1907161 = 2841^2 + 1381^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2494609 + ... + 2494612.

Almost surely, 2^9978442 is an apocalyptic number.

9978442 is a deficient number, since it is larger than the sum of its proper divisors (4989224).

9978442 is a wasteful number, since it uses less digits than its factorization.

9978442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4989223.

The product of its digits is 145152, while the sum is 43.

The square root of 9978442 is about 3158.8672020204. The cubic root of 9978442 is about 215.2885399409.

The spelling of 9978442 in words is "nine million, nine hundred seventy-eight thousand, four hundred forty-two".