421591540 has 24 divisors (see below), whose sum is σ = 890295840. Its totient is φ = 167693088.

The previous prime is 421591529. The next prime is 421591543. The reversal of 421591540 is 45195124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421591543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55302 + ... + 62461.

It is an arithmetic number, because the mean of its divisors is an integer number (37095660).

Almost surely, 2^421591540 is an apocalyptic number.

It is an amenable number.

421591540 is an abundant number, since it is smaller than the sum of its proper divisors (468704300).

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

421591540 is a wasteful number, since it uses less digits than its factorization.

421591540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117951 (or 117949 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 421591540 is about 20532.6944164666. The cubic root of 421591540 is about 749.8319860683.

The spelling of 421591540 in words is "four hundred twenty-one million, five hundred ninety-one thousand, five hundred forty".