402115261 has 8 divisors (see below), whose sum is σ = 407757240. Its totient is φ = 396498432.

The previous prime is 402115253. The next prime is 402115271. The reversal of 402115261 is 162511204.

It can be written as a sum of positive squares in 4 ways, for example, as 8886361 + 393228900 = 2981^2 + 19830^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 402115261 - 2³ = 402115253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402115201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27141 + ... + 39253.

It is an arithmetic number, because the mean of its divisors is an integer number (50969655).

Almost surely, 2^402115261 is an apocalyptic number.

It is an amenable number.

402115261 is a deficient number, since it is larger than the sum of its proper divisors (5641979).

402115261 is a wasteful number, since it uses less digits than its factorization.

402115261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12575.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 402115261 is about 20052.8117978502. The cubic root of 402115261 is about 738.1027984044.

Adding to 402115261 its reverse (162511204), we get a palindrome (564626465).

The spelling of 402115261 in words is "four hundred two million, one hundred fifteen thousand, two hundred sixty-one".