397147539 has 4 divisors (see below), whose sum is σ = 529530056. Its totient is φ = 264765024.

The previous prime is 397147537. The next prime is 397147549. The reversal of 397147539 is 935741793.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 397147539 - 2¹ = 397147537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397147537) 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, 66191254 + ... + 66191259.

It is an arithmetic number, because the mean of its divisors is an integer number (132382514).

Almost surely, 2^397147539 is an apocalyptic number.

397147539 is a deficient number, since it is larger than the sum of its proper divisors (132382517).

397147539 is a wasteful number, since it uses less digits than its factorization.

397147539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132382516.

The product of its digits is 714420, while the sum is 48.

The square root of 397147539 is about 19928.5608863259. The cubic root of 397147539 is about 735.0506938981.

The spelling of 397147539 in words is "three hundred ninety-seven million, one hundred forty-seven thousand, five hundred thirty-nine".