397832557 has 4 divisors (see below), whose sum is σ = 397983520. Its totient is φ = 397681596.

The previous prime is 397832543. The next prime is 397832569. The reversal of 397832557 is 755238793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 397832557 - 2¹⁹ = 397308269 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 397832557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397832537) 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, 71457 + ... + 76822.

It is an arithmetic number, because the mean of its divisors is an integer number (99495880).

Almost surely, 2^397832557 is an apocalyptic number.

It is an amenable number.

397832557 is a deficient number, since it is larger than the sum of its proper divisors (150963).

397832557 is a wasteful number, since it uses less digits than its factorization.

397832557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150962.

The product of its digits is 1587600, while the sum is 49.

The square root of 397832557 is about 19945.7403221841. The cubic root of 397832557 is about 735.4730673523.

The spelling of 397832557 in words is "three hundred ninety-seven million, eight hundred thirty-two thousand, five hundred fifty-seven".