978494407 has 4 divisors (see below), whose sum is σ = 1067448456. Its totient is φ = 889540360.

The previous prime is 978494389. The next prime is 978494431. The reversal of 978494407 is 704494879.

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

It is a cyclic number.

It is not a de Polignac number, because 978494407 - 2²⁷ = 844276679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978494437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44477008 + ... + 44477029.

It is an arithmetic number, because the mean of its divisors is an integer number (266862114).

Almost surely, 2^978494407 is an apocalyptic number.

978494407 is a deficient number, since it is larger than the sum of its proper divisors (88954049).

978494407 is a wasteful number, since it uses less digits than its factorization.

978494407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88954048.

The product of its (nonzero) digits is 2032128, while the sum is 52.

The square root of 978494407 is about 31280.8952397466. The cubic root of 978494407 is about 992.7794582609.

The spelling of 978494407 in words is "nine hundred seventy-eight million, four hundred ninety-four thousand, four hundred seven".