397895549 has 4 divisors (see below), whose sum is σ = 418837440. Its totient is φ = 376953660.

The previous prime is 397895543. The next prime is 397895567. The reversal of 397895549 is 945598793.

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, and also an emirpimes, since its reverse is a distinct semiprime: 945598793 = 23 ⋅41112991.

It is a cyclic number.

It is not a de Polignac number, because 397895549 - 2²⁰ = 396846973 is a prime.

It is a super-2 number, since 2×397895549² = 316641735828022802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397895543) 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, 10470917 + ... + 10470954.

It is an arithmetic number, because the mean of its divisors is an integer number (104709360).

Almost surely, 2^397895549 is an apocalyptic number.

It is an amenable number.

397895549 is a deficient number, since it is larger than the sum of its proper divisors (20941891).

397895549 is a wasteful number, since it uses less digits than its factorization.

397895549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20941890.

The product of its digits is 12247200, while the sum is 59.

The square root of 397895549 is about 19947.3193437113. The cubic root of 397895549 is about 735.5118830748.

The spelling of 397895549 in words is "three hundred ninety-seven million, eight hundred ninety-five thousand, five hundred forty-nine".