1405721445 has 16 divisors (see below), whose sum is σ = 2249904192. Its totient is φ = 749468160.

The previous prime is 1405721419. The next prime is 1405721459. The reversal of 1405721445 is 5441275041.

It is not a de Polignac number, because 1405721445 - 2²³ = 1397332837 is a prime.

It is a super-3 number, since 3×1405721445³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36474 + ... + 64356.

It is an arithmetic number, because the mean of its divisors is an integer number (140619012).

Almost surely, 2^1405721445 is an apocalyptic number.

1405721445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1405721445 is a deficient number, since it is larger than the sum of its proper divisors (844182747).

1405721445 is a wasteful number, since it uses less digits than its factorization.

1405721445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31252.

The product of its (nonzero) digits is 22400, while the sum is 33.

The square root of 1405721445 is about 37492.9519376642. The cubic root of 1405721445 is about 1120.2108034860.

Adding to 1405721445 its reverse (5441275041), we get a palindrome (6846996486).

The spelling of 1405721445 in words is "one billion, four hundred five million, seven hundred twenty-one thousand, four hundred forty-five".