402240243 has 4 divisors (see below), whose sum is σ = 536320328. Its totient is φ = 268160160.

The previous prime is 402240239. The next prime is 402240257. The reversal of 402240243 is 342042204.

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

It is not a de Polignac number, because 402240243 - 2² = 402240239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402240233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67040038 + ... + 67040043.

It is an arithmetic number, because the mean of its divisors is an integer number (134080082).

Almost surely, 2^402240243 is an apocalyptic number.

402240243 is a deficient number, since it is larger than the sum of its proper divisors (134080085).

402240243 is a wasteful number, since it uses less digits than its factorization.

402240243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134080084.

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 402240243 is about 20055.9278768149. The cubic root of 402240243 is about 738.1792607334.

Adding to 402240243 its reverse (342042204), we get a palindrome (744282447).

The spelling of 402240243 in words is "four hundred two million, two hundred forty thousand, two hundred forty-three".