978497427 has 4 divisors (see below), whose sum is σ = 1304663240. Its totient is φ = 652331616.

The previous prime is 978497411. The next prime is 978497447. The reversal of 978497427 is 724794879.

It is a happy number.

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

It is not a de Polignac number, because 978497427 - 2⁴ = 978497411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978497447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163082902 + ... + 163082907.

It is an arithmetic number, because the mean of its divisors is an integer number (326165810).

Almost surely, 2^978497427 is an apocalyptic number.

978497427 is a deficient number, since it is larger than the sum of its proper divisors (326165813).

978497427 is a wasteful number, since it uses less digits than its factorization.

978497427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326165812.

The product of its digits is 7112448, while the sum is 57.

The square root of 978497427 is about 31280.9435119851. The cubic root of 978497427 is about 992.7804796229.

The spelling of 978497427 in words is "nine hundred seventy-eight million, four hundred ninety-seven thousand, four hundred twenty-seven".