402440111 has 4 divisors (see below), whose sum is σ = 406962000. Its totient is φ = 397918224.

The previous prime is 402440081. The next prime is 402440113. The reversal of 402440111 is 111044204.

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 402440111 - 2¹⁴ = 402423727 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 402440111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402440113) 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, 2260811 + ... + 2260988.

It is an arithmetic number, because the mean of its divisors is an integer number (101740500).

Almost surely, 2^402440111 is an apocalyptic number.

402440111 is a deficient number, since it is larger than the sum of its proper divisors (4521889).

402440111 is an equidigital number, since it uses as much as digits as its factorization.

402440111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4521888.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 402440111 is about 20060.9100242237. The cubic root of 402440111 is about 738.3015044134.

Adding to 402440111 its reverse (111044204), we get a palindrome (513484315).

The spelling of 402440111 in words is "four hundred two million, four hundred forty thousand, one hundred eleven".