1405724 has 12 divisors (see below), whose sum is σ = 2486064. Its totient is φ = 695424.

The previous prime is 1405721. The next prime is 1405751. The reversal of 1405724 is 4275041.

It is a super-3 number, since 3×1405724³ = 8333384751244030272, which contains 333 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1405724.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1405721) 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, 1424 + ... + 2199.

It is an arithmetic number, because the mean of its divisors is an integer number (207172).

2^1405724 is an apocalyptic number.

It is an amenable number.

1405724 is a deficient number, since it is larger than the sum of its proper divisors (1080340).

1405724 is a wasteful number, since it uses less digits than its factorization.

1405724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3724 (or 3722 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 1405724 is about 1185.6323207470. The cubic root of 1405724 is about 112.0211482174.

The spelling of 1405724 in words is "one million, four hundred five thousand, seven hundred twenty-four".