405665153 has 4 divisors (see below), whose sum is σ = 405940548. Its totient is φ = 405389760.

The previous prime is 405665123. The next prime is 405665159. The reversal of 405665153 is 351566504.

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 114211969 + 291453184 = 10687^2 + 17072^2 .

It is a cyclic number.

It is not a de Polignac number, because 405665153 - 2⁶ = 405665089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405665159) 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, 135476 + ... + 138437.

It is an arithmetic number, because the mean of its divisors is an integer number (101485137).

Almost surely, 2^405665153 is an apocalyptic number.

It is an amenable number.

405665153 is a deficient number, since it is larger than the sum of its proper divisors (275395).

405665153 is a wasteful number, since it uses less digits than its factorization.

405665153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275394.

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 405665153 is about 20141.1308768897. The cubic root of 405665153 is about 740.2684398634.

The spelling of 405665153 in words is "four hundred five million, six hundred sixty-five thousand, one hundred fifty-three".