1405818445 has 4 divisors (see below), whose sum is σ = 1686982140. Its totient is φ = 1124654752.

The previous prime is 1405818437. The next prime is 1405818461. The reversal of 1405818445 is 5448185041.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1035101929 + 370716516 = 32173^2 + 19254^2 .

It is a cyclic number.

It is not a de Polignac number, because 1405818445 - 2³ = 1405818437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1405818398 and 1405818407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140581840 + ... + 140581849.

It is an arithmetic number, because the mean of its divisors is an integer number (421745535).

Almost surely, 2^1405818445 is an apocalyptic number.

It is an amenable number.

1405818445 is a deficient number, since it is larger than the sum of its proper divisors (281163695).

1405818445 is an equidigital number, since it uses as much as digits as its factorization.

1405818445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281163694.

The product of its (nonzero) digits is 102400, while the sum is 40.

The square root of 1405818445 is about 37494.2454918085. The cubic root of 1405818445 is about 1120.2365691285.

The spelling of 1405818445 in words is "one billion, four hundred five million, eight hundred eighteen thousand, four hundred forty-five".