402445 has 4 divisors (see below), whose sum is σ = 482940. Its totient is φ = 321952.

The previous prime is 402443. The next prime is 402487. The reversal of 402445 is 544204.

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 298116 + 104329 = 546^2 + 323^2 .

It is a cyclic number.

It is not a de Polignac number, because 402445 - 2¹ = 402443 is a prime.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40240 + ... + 40249.

It is an arithmetic number, because the mean of its divisors is an integer number (120735).

2⁴⁰²⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

402445 is a deficient number, since it is larger than the sum of its proper divisors (80495).

402445 is an equidigital number, since it uses as much as digits as its factorization.

402445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80494.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 402445 is about 634.3855294693. The cubic root of 402445 is about 73.8304494126.

Adding to 402445 its reverse (544204), we get a palindrome (946649).

It can be divided in two parts, 40 and 2445, that added together give a triangular number (2485 = T₇₀).

The spelling of 402445 in words is "four hundred two thousand, four hundred forty-five".