421138536 has 192 divisors, whose sum is σ = 1334894400. Its totient is φ = 110388096.

The previous prime is 421138489. The next prime is 421138537. The reversal of 421138536 is 635831124.

It is a junction number, because it is equal to n+sod(n) for n = 421138497 and 421138506.

It is not an unprimeable number, because it can be changed into a prime (421138537) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2583591 + ... + 2583753.

It is an arithmetic number, because the mean of its divisors is an integer number (6952575).

Almost surely, 2^421138536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421138536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (667447200).

421138536 is an abundant number, since it is smaller than the sum of its proper divisors (913755864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421138536 is a wasteful number, since it uses less digits than its factorization.

421138536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225 (or 188 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 421138536 is about 20521.6601667604. The cubic root of 421138536 is about 749.5633226888.

The spelling of 421138536 in words is "four hundred twenty-one million, one hundred thirty-eight thousand, five hundred thirty-six".