396129505 has 4 divisors (see below), whose sum is σ = 475355412. Its totient is φ = 316903600.

The previous prime is 396129497. The next prime is 396129551. The reversal of 396129505 is 505921693.

It is a happy number.

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 226713249 + 169416256 = 15057^2 + 13016^2 .

It is not a de Polignac number, because 396129505 - 2³ = 396129497 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39612946 + ... + 39612955.

It is an arithmetic number, because the mean of its divisors is an integer number (118838853).

Almost surely, 2^396129505 is an apocalyptic number.

It is an amenable number.

396129505 is a deficient number, since it is larger than the sum of its proper divisors (79225907).

396129505 is an equidigital number, since it uses as much as digits as its factorization.

396129505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79225906.

The product of its (nonzero) digits is 72900, while the sum is 40.

The square root of 396129505 is about 19903.0024116966. The cubic root of 396129505 is about 734.4220887989.

The spelling of 396129505 in words is "three hundred ninety-six million, one hundred twenty-nine thousand, five hundred five".