391144036 has 12 divisors (see below), whose sum is σ = 684997740. Its totient is φ = 195430400.

The previous prime is 391144031. The next prime is 391144043. The reversal of 391144036 is 630441193.

It can be written as a sum of positive squares in 2 ways, for example, as 101123136 + 290020900 = 10056^2 + 17030^2 .

It is a junction number, because it is equal to n+sod(n) for n = 391143989 and 391144007.

It is not an unprimeable number, because it can be changed into a prime (391144031) 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, 29065 + ... + 40336.

It is an arithmetic number, because the mean of its divisors is an integer number (57083145).

Almost surely, 2^391144036 is an apocalyptic number.

It is an amenable number.

391144036 is a deficient number, since it is larger than the sum of its proper divisors (293853704).

391144036 is a wasteful number, since it uses less digits than its factorization.

391144036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70814 (or 70812 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 391144036 is about 19777.3617047371. The cubic root of 391144036 is about 731.3280609583.

The spelling of 391144036 in words is "three hundred ninety-one million, one hundred forty-four thousand, thirty-six".