397427287 has 8 divisors (see below), whose sum is σ = 399798000. Its totient is φ = 395062464.

The previous prime is 397427279. The next prime is 397427291. The reversal of 397427287 is 782724793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 397427287 - 2³ = 397427279 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 397427287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397427297) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237289 + ... + 238957.

It is an arithmetic number, because the mean of its divisors is an integer number (49974750).

Almost surely, 2^397427287 is an apocalyptic number.

397427287 is a deficient number, since it is larger than the sum of its proper divisors (2370713).

397427287 is a wasteful number, since it uses less digits than its factorization.

397427287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2945.

The product of its digits is 1185408, while the sum is 49.

The square root of 397427287 is about 19935.5784215056. The cubic root of 397427287 is about 735.2232416115.

The spelling of 397427287 in words is "three hundred ninety-seven million, four hundred twenty-seven thousand, two hundred eighty-seven".