402240001 has 4 divisors (see below), whose sum is σ = 407750212. Its totient is φ = 396729792.

The previous prime is 402239983. The next prime is 402240011. The reversal of 402240001 is 100042204.

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

It can be written as a sum of positive squares in 2 ways, for example, as 244109376 + 158130625 = 15624^2 + 12575^2 .

It is a cyclic number.

It is not a de Polignac number, because 402240001 - 2⁵ = 402239969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402240011) 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, 2754996 + ... + 2755141.

It is an arithmetic number, because the mean of its divisors is an integer number (101937553).

Almost surely, 2^402240001 is an apocalyptic number.

It is an amenable number.

402240001 is a deficient number, since it is larger than the sum of its proper divisors (5510211).

402240001 is an equidigital number, since it uses as much as digits as its factorization.

402240001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5510210.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 402240001 is about 20055.9218436850. The cubic root of 402240001 is about 738.1791126963.

Adding to 402240001 its reverse (100042204), we get a palindrome (502282205).

The spelling of 402240001 in words is "four hundred two million, two hundred forty thousand, one".