531378 has 24 divisors (see below), whose sum is σ = 1175148. Its totient is φ = 173472.

The previous prime is 531359. The next prime is 531383. The reversal of 531378 is 873135.

It can be written as a sum of positive squares in 2 ways, for example, as 522729 + 8649 = 723^2 + 93^2 .

It is a nialpdrome in base 9.

It is an unprimeable number.

531378 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 676 + ... + 1232.

531378 is a Friedman number, since it can be written as ((8+1)^5-7)*3*3, using all its digits and the basic arithmetic operations.

2⁵³¹³⁷⁸ is an apocalyptic number.

531378 is an abundant number, since it is smaller than the sum of its proper divisors (643770).

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

531378 is a wasteful number, since it uses less digits than its factorization.

531378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618 (or 615 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 531378 is about 728.9567888428. The cubic root of 531378 is about 80.9967991419.

It can be divided in two parts, 5313 and 78, that multiplied together give a palindrome (414414).

The spelling of 531378 in words is "five hundred thirty-one thousand, three hundred seventy-eight".