396140909 has 8 divisors (see below), whose sum is σ = 409152000. Its totient is φ = 383144400.

The previous prime is 396140903. The next prime is 396140929. The reversal of 396140909 is 909041693.

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

It is a cyclic number.

It is not a de Polignac number, because 396140909 - 2²⁰ = 395092333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396140903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90839 + ... + 95099.

It is an arithmetic number, because the mean of its divisors is an integer number (51144000).

Almost surely, 2^396140909 is an apocalyptic number.

It is an amenable number.

396140909 is a deficient number, since it is larger than the sum of its proper divisors (13011091).

396140909 is a wasteful number, since it uses less digits than its factorization.

396140909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7291.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 396140909 is about 19903.2888990739. The cubic root of 396140909 is about 734.4291363839.

The spelling of 396140909 in words is "three hundred ninety-six million, one hundred forty thousand, nine hundred nine".