978457 has 2 divisors, whose sum is σ = 978458. Its totient is φ = 978456.

The previous prime is 978449. The next prime is 978463. The reversal of 978457 is 754879.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 968256 + 10201 = 984^2 + 101^2 .

It is a cyclic number.

It is not a de Polignac number, because 978457 - 2³ = 978449 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (978427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489228 + 489229.

It is an arithmetic number, because the mean of its divisors is an integer number (489229).

2⁹⁷⁸⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

978457 is a deficient number, since it is larger than the sum of its proper divisors (1).

978457 is an equidigital number, since it uses as much as digits as its factorization.

978457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70560, while the sum is 40.

The square root of 978457 is about 989.1698539685. The cubic root of 978457 is about 99.2766807065.

The spelling of 978457 in words is "nine hundred seventy-eight thousand, four hundred fifty-seven".