391377253 has 8 divisors (see below), whose sum is σ = 395757560. Its totient is φ = 387011520.

The previous prime is 391377251. The next prime is 391377277. The reversal of 391377253 is 352773193.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4743684 + 386633569 = 2178^2 + 19663^2 .

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 391377253 - 2¹ = 391377251 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 (391377251) by changing a digit.

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, 55651 + ... + 62287.

It is an arithmetic number, because the mean of its divisors is an integer number (49469695).

Almost surely, 2^391377253 is an apocalyptic number.

It is an amenable number.

391377253 is a deficient number, since it is larger than the sum of its proper divisors (4380307).

391377253 is a wasteful number, since it uses less digits than its factorization.

391377253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7287.

The product of its digits is 119070, while the sum is 40.

The square root of 391377253 is about 19783.2568855586. The cubic root of 391377253 is about 731.4733818920.

The spelling of 391377253 in words is "three hundred ninety-one million, three hundred seventy-seven thousand, two hundred fifty-three".