978494409 has 24 divisors (see below), whose sum is σ = 1457083680. Its totient is φ = 632463552.

The previous prime is 978494389. The next prime is 978494431. The reversal of 978494409 is 904494879.

It is a happy number.

978494409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 978494409 - 2²⁸ = 710058953 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (978494609) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26142 + ... + 51384.

It is an arithmetic number, because the mean of its divisors is an integer number (60711820).

Almost surely, 2^978494409 is an apocalyptic number.

It is an amenable number.

978494409 is a deficient number, since it is larger than the sum of its proper divisors (478589271).

978494409 is a wasteful number, since it uses less digits than its factorization.

978494409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25381 (or 25378 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The square root of 978494409 is about 31280.8952717150. The cubic root of 978494409 is about 992.7794589373.

The spelling of 978494409 in words is "nine hundred seventy-eight million, four hundred ninety-four thousand, four hundred nine".