397421787 has 8 divisors (see below), whose sum is σ = 605595136. Its totient is φ = 227098152.

The previous prime is 397421779. The next prime is 397421789. The reversal of 397421787 is 787124793.

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

It is not a de Polignac number, because 397421787 - 2³ = 397421779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397421789) 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, 9462403 + ... + 9462444.

It is an arithmetic number, because the mean of its divisors is an integer number (75699392).

Almost surely, 2^397421787 is an apocalyptic number.

397421787 is a deficient number, since it is larger than the sum of its proper divisors (208173349).

397421787 is a wasteful number, since it uses less digits than its factorization.

397421787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18924857.

The product of its digits is 592704, while the sum is 48.

The square root of 397421787 is about 19935.4404766988. The cubic root of 397421787 is about 735.2198500087.

The spelling of 397421787 in words is "three hundred ninety-seven million, four hundred twenty-one thousand, seven hundred eighty-seven".