1445405 has 16 divisors (see below), whose sum is σ = 1921584. Its totient is φ = 1036800.

The previous prime is 1445401. The next prime is 1445407. The reversal of 1445405 is 5045441.

It can be written as a sum of positive squares in 8 ways, for example, as 31684 + 1413721 = 178^2 + 1189^2 .

It is not a de Polignac number, because 1445405 - 2² = 1445401 is a prime.

It is a super-2 number, since 2×1445405² = 4178391228050, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1445401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2105 + ... + 2705.

It is an arithmetic number, because the mean of its divisors is an integer number (120099).

2^1445405 is an apocalyptic number.

It is an amenable number.

1445405 is a deficient number, since it is larger than the sum of its proper divisors (476179).

1445405 is a wasteful number, since it uses less digits than its factorization.

1445405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 1445405 is about 1202.2499740071. The cubic root of 1445405 is about 113.0654331660.

It can be divided in two parts, 1445 and 405, that multiplied together give a square (585225 = 765²).

The spelling of 1445405 in words is "one million, four hundred forty-five thousand, four hundred five".