421439842 has 8 divisors (see below), whose sum is σ = 649245276. Its totient is φ = 205024752.

The previous prime is 421439827. The next prime is 421439867. The reversal of 421439842 is 248934124.

It is a Cunningham number, because it is equal to 20529²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 421439841 + 1 = 20529^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×421439842² = 355223080849969928, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2847493 + ... + 2847640.

Almost surely, 2^421439842 is an apocalyptic number.

421439842 is a deficient number, since it is larger than the sum of its proper divisors (227805434).

421439842 is a wasteful number, since it uses less digits than its factorization.

421439842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5695172.

The product of its digits is 55296, while the sum is 37.

The square root of 421439842 is about 20529.0000243558. Note that the first 4 decimals coincide. The cubic root of 421439842 is about 749.7420398782.

The spelling of 421439842 in words is "four hundred twenty-one million, four hundred thirty-nine thousand, eight hundred forty-two".