405172330 has 8 divisors (see below), whose sum is σ = 729310212. Its totient is φ = 162068928.

The previous prime is 405172297. The next prime is 405172331. The reversal of 405172330 is 33271504.

It can be written as a sum of positive squares in 2 ways, for example, as 402925329 + 2247001 = 20073^2 + 1499^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 405172295 and 405172304.

It is not an unprimeable number, because it can be changed into a prime (405172331) 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, 20258607 + ... + 20258626.

Almost surely, 2^405172330 is an apocalyptic number.

405172330 is a deficient number, since it is larger than the sum of its proper divisors (324137882).

405172330 is a wasteful number, since it uses less digits than its factorization.

405172330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40517240.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 405172330 is about 20128.8929154089. The cubic root of 405172330 is about 739.9685462647.

The spelling of 405172330 in words is "four hundred five million, one hundred seventy-two thousand, three hundred thirty".