421415540 has 48 divisors (see below), whose sum is σ = 1089201792. Its totient is φ = 133370496.

The previous prime is 421415521. The next prime is 421415543. The reversal of 421415540 is 45514124.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421415543) 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, 113954 + ... + 117593.

It is an arithmetic number, because the mean of its divisors is an integer number (22691704).

Almost surely, 2^421415540 is an apocalyptic number.

It is an amenable number.

421415540 is an abundant number, since it is smaller than the sum of its proper divisors (667786252).

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

421415540 is a wasteful number, since it uses less digits than its factorization.

421415540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231576 (or 231574 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 421415540 is about 20528.4081214302. The cubic root of 421415540 is about 749.7276285044.

Adding to 421415540 its reverse (45514124), we get a palindrome (466929664).

The spelling of 421415540 in words is "four hundred twenty-one million, four hundred fifteen thousand, five hundred forty".