396937909 has 4 divisors (see below), whose sum is σ = 399835404. Its totient is φ = 394040416.

The previous prime is 396937907. The next prime is 396937921. The reversal of 396937909 is 909739693.

396937909 is nontrivially palindromic in base 4.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 909739693 = 41 ⋅22188773.

It can be written as a sum of positive squares in 2 ways, for example, as 286624900 + 110313009 = 16930^2 + 10503^2 .

It is a cyclic number.

It is not a de Polignac number, because 396937909 - 2¹ = 396937907 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 396937909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396937907) 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, 1448542 + ... + 1448815.

It is an arithmetic number, because the mean of its divisors is an integer number (99958851).

Almost surely, 2^396937909 is an apocalyptic number.

It is an amenable number.

396937909 is a deficient number, since it is larger than the sum of its proper divisors (2897495).

396937909 is a wasteful number, since it uses less digits than its factorization.

396937909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2897494.

The product of its (nonzero) digits is 2480058, while the sum is 55.

The square root of 396937909 is about 19923.3006552629. The cubic root of 396937909 is about 734.9213416372.

The spelling of 396937909 in words is "three hundred ninety-six million, nine hundred thirty-seven thousand, nine hundred nine".