997278 has 16 divisors (see below), whose sum is σ = 2004480. Its totient is φ = 330776.

The previous prime is 997273. The next prime is 997279. The reversal of 997278 is 872799.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 997278.

It is not an unprimeable number, because it can be changed into a prime (997273) 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, 1843 + ... + 2321.

It is an arithmetic number, because the mean of its divisors is an integer number (125280).

2⁹⁹⁷²⁷⁸ is an apocalyptic number.

997278 is an abundant number, since it is smaller than the sum of its proper divisors (1007202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

997278 is a wasteful number, since it uses less digits than its factorization.

997278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831.

The product of its digits is 63504, while the sum is 42.

The square root of 997278 is about 998.6380725768. The cubic root of 997278 is about 99.9091842166.

It can be divided in two parts, 997 and 278, that added together give a triangular number (1275 = T₅₀).

The spelling of 997278 in words is "nine hundred ninety-seven thousand, two hundred seventy-eight".