391397045 has 16 divisors (see below), whose sum is σ = 514102512. Its totient is φ = 284290560.

The previous prime is 391397023. The next prime is 391397053. The reversal of 391397045 is 540793193.

It can be written as a sum of positive squares in 8 ways, for example, as 32787076 + 358609969 = 5726^2 + 18937^2 .

It is not a de Polignac number, because 391397045 - 2¹⁰ = 391396021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 391396993 and 391397011.

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 15 ways as a sum of consecutive naturals, for example, 45392 + ... + 53321.

It is an arithmetic number, because the mean of its divisors is an integer number (32131407).

Almost surely, 2^391397045 is an apocalyptic number.

It is an amenable number.

391397045 is a deficient number, since it is larger than the sum of its proper divisors (122705467).

391397045 is a wasteful number, since it uses less digits than its factorization.

391397045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98792.

The product of its (nonzero) digits is 102060, while the sum is 41.

The square root of 391397045 is about 19783.7571002072. The cubic root of 391397045 is about 731.4857119198.

The spelling of 391397045 in words is "three hundred ninety-one million, three hundred ninety-seven thousand, forty-five".