421615540 has 12 divisors (see below), whose sum is σ = 885392676. Its totient is φ = 168646208.

The previous prime is 421615483. The next prime is 421615541. The reversal of 421615540 is 45516124.

It can be written as a sum of positive squares in 2 ways, for example, as 259918884 + 161696656 = 16122^2 + 12716^2 .

It is a junction number, because it is equal to n+sod(n) for n = 421615499 and 421615508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421615541) 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, 10540369 + ... + 10540408.

It is an arithmetic number, because the mean of its divisors is an integer number (73782723).

Almost surely, 2^421615540 is an apocalyptic number.

It is an amenable number.

421615540 is an abundant number, since it is smaller than the sum of its proper divisors (463777136).

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

421615540 is a wasteful number, since it uses less digits than its factorization.

421615540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21080786 (or 21080784 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 421615540 is about 20533.2788419190. The cubic root of 421615540 is about 749.8462143947.

The spelling of 421615540 in words is "four hundred twenty-one million, six hundred fifteen thousand, five hundred forty".