397021489 has 4 divisors (see below), whose sum is σ = 403530100. Its totient is φ = 390512880.

The previous prime is 397021487. The next prime is 397021501. The reversal of 397021489 is 984120793.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 83448225 + 313573264 = 9135^2 + 17708^2 .

It is a cyclic number.

It is not a de Polignac number, because 397021489 - 2¹ = 397021487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397021483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3254214 + ... + 3254335.

It is an arithmetic number, because the mean of its divisors is an integer number (100882525).

Almost surely, 2^397021489 is an apocalyptic number.

It is an amenable number.

397021489 is a deficient number, since it is larger than the sum of its proper divisors (6508611).

397021489 is an equidigital number, since it uses as much as digits as its factorization.

397021489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6508610.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 397021489 is about 19925.3980888714. The cubic root of 397021489 is about 734.9729201617.

The spelling of 397021489 in words is "three hundred ninety-seven million, twenty-one thousand, four hundred eighty-nine".