396191540 has 24 divisors (see below), whose sum is σ = 833092512. Its totient is φ = 158268960.

The previous prime is 396191531. The next prime is 396191567. The reversal of 396191540 is 45191693.

It is a junction number, because it is equal to n+sod(n) for n = 396191494 and 396191503.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3155 + ... + 28325.

It is an arithmetic number, because the mean of its divisors is an integer number (34712188).

Almost surely, 2^396191540 is an apocalyptic number.

It is an amenable number.

396191540 is an abundant number, since it is smaller than the sum of its proper divisors (436900972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

396191540 is a wasteful number, since it uses less digits than its factorization.

396191540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25967 (or 25965 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 396191540 is about 19904.5607839008. The cubic root of 396191540 is about 734.4604243227.

The spelling of 396191540 in words is "three hundred ninety-six million, one hundred ninety-one thousand, five hundred forty".