245640402 has 24 divisors (see below), whose sum is σ = 608252736. Its totient is φ = 70182936.

The previous prime is 245640347. The next prime is 245640407. The reversal of 245640402 is 204046542.

245640402 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (245640407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 974638 + ... + 974889.

It is an arithmetic number, because the mean of its divisors is an integer number (25343864).

Almost surely, 2^245640402 is an apocalyptic number.

245640402 is an abundant number, since it is smaller than the sum of its proper divisors (362612334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

245640402 is a wasteful number, since it uses less digits than its factorization.

245640402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949542 (or 1949539 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 245640402 is about 15672.9193834461. The cubic root of 245640402 is about 626.2771979534.

Adding to 245640402 its reverse (204046542), we get a palindrome (449686944).

The spelling of 245640402 in words is "two hundred forty-five million, six hundred forty thousand, four hundred two".