397421587 has 4 divisors (see below), whose sum is σ = 402452320. Its totient is φ = 392390856.

The previous prime is 397421543. The next prime is 397421593. The reversal of 397421587 is 785124793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 785124793 = 37 ⋅21219589.

It is a cyclic number.

It is not a de Polignac number, because 397421587 - 2¹⁹ = 396897299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397427587) 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, 2515248 + ... + 2515405.

It is an arithmetic number, because the mean of its divisors is an integer number (100613080).

Almost surely, 2^397421587 is an apocalyptic number.

397421587 is a deficient number, since it is larger than the sum of its proper divisors (5030733).

397421587 is an equidigital number, since it uses as much as digits as its factorization.

397421587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5030732.

The product of its digits is 423360, while the sum is 46.

The square root of 397421587 is about 19935.4354605060. The cubic root of 397421587 is about 735.2197266771.

The spelling of 397421587 in words is "three hundred ninety-seven million, four hundred twenty-one thousand, five hundred eighty-seven".