978783 has 8 divisors (see below), whose sum is σ = 1405488. Its totient is φ = 602304.

The previous prime is 978773. The next prime is 978797. The reversal of 978783 is 387879.

978783 = 27² + 28² + ... + 143².

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 978783 - 2¹⁶ = 913247 is a prime.

It is a super-2 number, since 2×978783² = 1916032322178, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12510 + ... + 12587.

It is an arithmetic number, because the mean of its divisors is an integer number (175686).

2⁹⁷⁸⁷⁸³ is an apocalyptic number.

978783 is a deficient number, since it is larger than the sum of its proper divisors (426705).

978783 is a wasteful number, since it uses less digits than its factorization.

978783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25113.

The product of its digits is 84672, while the sum is 42.

The square root of 978783 is about 989.3346248868. The cubic root of 978783 is about 99.2877050725.

It can be divided in two parts, 9787 and 83, that added together give a triangular number (9870 = T₁₄₀).

The spelling of 978783 in words is "nine hundred seventy-eight thousand, seven hundred eighty-three".