402640603 has 4 divisors (see below), whose sum is σ = 409465080. Its totient is φ = 395816128.

The previous prime is 402640577. The next prime is 402640613. The reversal of 402640603 is 306046204.

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

It is a cyclic number.

It is not a de Polignac number, because 402640603 - 2²⁵ = 369086171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402640613) 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 3 ways as a sum of consecutive naturals, for example, 3412150 + ... + 3412267.

It is an arithmetic number, because the mean of its divisors is an integer number (102366270).

Almost surely, 2^402640603 is an apocalyptic number.

402640603 is a deficient number, since it is larger than the sum of its proper divisors (6824477).

402640603 is an equidigital number, since it uses as much as digits as its factorization.

402640603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6824476.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 402640603 is about 20065.9064833862. The cubic root of 402640603 is about 738.4240890884.

Adding to 402640603 its reverse (306046204), we get a palindrome (708686807).

The spelling of 402640603 in words is "four hundred two million, six hundred forty thousand, six hundred three".