397671749 has 4 divisors (see below), whose sum is σ = 404191020. Its totient is φ = 391152480.

The previous prime is 397671739. The next prime is 397671761. The reversal of 397671749 is 947176793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 947176793 = 41 ⋅23101873.

It can be written as a sum of positive squares in 2 ways, for example, as 60949249 + 336722500 = 7807^2 + 18350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397671749 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 397671749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397671739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3259544 + ... + 3259665.

It is an arithmetic number, because the mean of its divisors is an integer number (101047755).

Almost surely, 2^397671749 is an apocalyptic number.

It is an amenable number.

397671749 is a deficient number, since it is larger than the sum of its proper divisors (6519271).

397671749 is an equidigital number, since it uses as much as digits as its factorization.

397671749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6519270.

The product of its digits is 2000376, while the sum is 53.

The square root of 397671749 is about 19941.7087783369. The cubic root of 397671749 is about 735.3739587451.

The spelling of 397671749 in words is "three hundred ninety-seven million, six hundred seventy-one thousand, seven hundred forty-nine".