402543645 has 32 divisors (see below), whose sum is σ = 741900288. Its totient is φ = 182564928.

The previous prime is 402543643. The next prime is 402543653. The reversal of 402543645 is 546345204.

It is not a de Polignac number, because 402543645 - 2¹ = 402543643 is a prime.

It is a super-2 number, since 2×402543645² = 324082772259772050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402543641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1759 + ... + 28428.

It is an arithmetic number, because the mean of its divisors is an integer number (23184384).

Almost surely, 2^402543645 is an apocalyptic number.

It is an amenable number.

402543645 is a deficient number, since it is larger than the sum of its proper divisors (339356643).

402543645 is a wasteful number, since it uses less digits than its factorization.

402543645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30329.

The product of its (nonzero) digits is 57600, while the sum is 33.

The square root of 402543645 is about 20063.4903493884. The cubic root of 402543645 is about 738.3648121799.

Adding to 402543645 its reverse (546345204), we get a palindrome (948888849).

The spelling of 402543645 in words is "four hundred two million, five hundred forty-three thousand, six hundred forty-five".