421539019 has 16 divisors (see below), whose sum is σ = 475009920. Its totient is φ = 370762560.

The previous prime is 421538981. The next prime is 421539043. The reversal of 421539019 is 910935124.

It is a cyclic number.

It is not a de Polignac number, because 421539019 - 2¹⁵ = 421506251 is a prime.

It is a super-2 number, since 2×421539019² = 355390289078964722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (421539049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46447 + ... + 54775.

It is an arithmetic number, because the mean of its divisors is an integer number (29688120).

Almost surely, 2^421539019 is an apocalyptic number.

421539019 is a deficient number, since it is larger than the sum of its proper divisors (53470901).

421539019 is a wasteful number, since it uses less digits than its factorization.

421539019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8490.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 421539019 is about 20531.4154163808. The cubic root of 421539019 is about 749.8008472704.

It can be divided in two parts, 4215 and 39019, that added together give a palindrome (43234).

The spelling of 421539019 in words is "four hundred twenty-one million, five hundred thirty-nine thousand, nineteen".