1405731 has 4 divisors (see below), whose sum is σ = 1874312. Its totient is φ = 937152.

The previous prime is 1405721. The next prime is 1405751. The reversal of 1405731 is 1375041.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1405731 - 2⁵ = 1405699 is a prime.

It is a super-3 number, since 3×1405731³ = 8333509243641698673, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1405698 and 1405707.

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, 234286 + ... + 234291.

It is an arithmetic number, because the mean of its divisors is an integer number (468578).

2^1405731 is an apocalyptic number.

1405731 is a deficient number, since it is larger than the sum of its proper divisors (468581).

1405731 is an equidigital number, since it uses as much as digits as its factorization.

1405731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468580.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 1405731 is about 1185.6352727547. The cubic root of 1405731 is about 112.0213341587.

The spelling of 1405731 in words is "one million, four hundred five thousand, seven hundred thirty-one".