402643445 has 8 divisors (see below), whose sum is σ = 486415800. Its totient is φ = 319952320.

The previous prime is 402643433. The next prime is 402643447. The reversal of 402643445 is 544346204.

402643445 = 331² + 332² + ... + 1075².

It can be written as a sum of positive squares in 4 ways, for example, as 18130564 + 384512881 = 4258^2 + 19609^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 402643445 - 2²⁶ = 335534581 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402643447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269486 + ... + 270975.

It is an arithmetic number, because the mean of its divisors is an integer number (60801975).

Almost surely, 2^402643445 is an apocalyptic number.

It is an amenable number.

402643445 is a deficient number, since it is larger than the sum of its proper divisors (83772355).

402643445 is a wasteful number, since it uses less digits than its factorization.

402643445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540615.

The product of its (nonzero) digits is 46080, while the sum is 32.

The square root of 402643445 is about 20065.9772998975. The cubic root of 402643445 is about 738.4258264495.

Adding to 402643445 its reverse (544346204), we get a palindrome (946989649).

The spelling of 402643445 in words is "four hundred two million, six hundred forty-three thousand, four hundred forty-five".