1398724 has 12 divisors (see below), whose sum is σ = 2475900. Its totient is φ = 691328.

The previous prime is 1398721. The next prime is 1398731. The reversal of 1398724 is 4278931.

It can be written as a sum of positive squares in 2 ways, for example, as 232324 + 1166400 = 482^2 + 1080^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1398724.

It is not an unprimeable number, because it can be changed into a prime (1398721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1609 + ... + 2320.

It is an arithmetic number, because the mean of its divisors is an integer number (206325).

2^1398724 is an apocalyptic number.

It is an amenable number.

1398724 is a deficient number, since it is larger than the sum of its proper divisors (1077176).

1398724 is a wasteful number, since it uses less digits than its factorization.

1398724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4022 (or 4020 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 1398724 is about 1182.6766252869. The cubic root of 1398724 is about 111.8348970419.

It can be divided in two parts, 139872 and 4, that added together give a square (139876 = 374²).

The spelling of 1398724 in words is "one million, three hundred ninety-eight thousand, seven hundred twenty-four".