398490587 has 4 divisors (see below), whose sum is σ = 434717016. Its totient is φ = 362264160.

The previous prime is 398490583. The next prime is 398490619. The reversal of 398490587 is 785094893.

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

It is a cyclic number.

It is not a de Polignac number, because 398490587 - 2² = 398490583 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398490583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18113198 + ... + 18113219.

It is an arithmetic number, because the mean of its divisors is an integer number (108679254).

Almost surely, 2^398490587 is an apocalyptic number.

398490587 is a deficient number, since it is larger than the sum of its proper divisors (36226429).

398490587 is a wasteful number, since it uses less digits than its factorization.

398490587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36226428.

The product of its (nonzero) digits is 2177280, while the sum is 53.

The square root of 398490587 is about 19962.2290088056. The cubic root of 398490587 is about 735.8783440177.

The spelling of 398490587 in words is "three hundred ninety-eight million, four hundred ninety thousand, five hundred eighty-seven".