396877405 has 4 divisors (see below), whose sum is σ = 476252892. Its totient is φ = 317501920.

The previous prime is 396877373. The next prime is 396877423. The reversal of 396877405 is 504778693.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 504778693 = 83 ⋅6081671.

It can be written as a sum of positive squares in 2 ways, for example, as 274598041 + 122279364 = 16571^2 + 11058^2 .

It is not a de Polignac number, because 396877405 - 2⁵ = 396877373 is a prime.

It is a Smith number, since the sum of its digits (49) 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 a congruent 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, 39687736 + ... + 39687745.

It is an arithmetic number, because the mean of its divisors is an integer number (119063223).

Almost surely, 2^396877405 is an apocalyptic number.

It is an amenable number.

396877405 is a deficient number, since it is larger than the sum of its proper divisors (79375487).

396877405 is an equidigital number, since it uses as much as digits as its factorization.

396877405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79375486.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The square root of 396877405 is about 19921.7821742935. The cubic root of 396877405 is about 734.8839991551.

The spelling of 396877405 in words is "three hundred ninety-six million, eight hundred seventy-seven thousand, four hundred five".