405115261 has 8 divisors (see below), whose sum is σ = 422930880. Its totient is φ = 387316512.

The previous prime is 405115259. The next prime is 405115309. The reversal of 405115261 is 162511504.

It is a happy number.

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 405115261 - 2¹ = 405115259 is a prime.

It is a super-4 number, since 4×405115261⁴ (a number of 36 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405115201) 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, 88126 + ... + 92608.

It is an arithmetic number, because the mean of its divisors is an integer number (52866360).

Almost surely, 2^405115261 is an apocalyptic number.

It is an amenable number.

405115261 is a deficient number, since it is larger than the sum of its proper divisors (17815619).

405115261 is a wasteful number, since it uses less digits than its factorization.

405115261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8435.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 405115261 is about 20127.4752763480. The cubic root of 405115261 is about 739.9338028196.

Adding to 405115261 its reverse (162511504), we get a palindrome (567626765).

The spelling of 405115261 in words is "four hundred five million, one hundred fifteen thousand, two hundred sixty-one".