398421503 has 8 divisors (see below), whose sum is σ = 424654560. Its totient is φ = 372499200.

The previous prime is 398421493. The next prime is 398421509. The reversal of 398421503 is 305124893.

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 398421503 - 2¹⁰ = 398420479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398421509) 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, 75038 + ... + 80171.

It is an arithmetic number, because the mean of its divisors is an integer number (53081820).

Almost surely, 2^398421503 is an apocalyptic number.

398421503 is a deficient number, since it is larger than the sum of its proper divisors (26233057).

398421503 is a wasteful number, since it uses less digits than its factorization.

398421503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155377.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 398421503 is about 19960.4985659176. The cubic root of 398421503 is about 735.8358165743.

The spelling of 398421503 in words is "three hundred ninety-eight million, four hundred twenty-one thousand, five hundred three".