421724240 has 40 divisors (see below), whose sum is σ = 1120583040. Its totient is φ = 144590976.

The previous prime is 421724227. The next prime is 421724243. The reversal of 421724240 is 42427124.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421724243) 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, 375980 + ... + 377099.

It is an arithmetic number, because the mean of its divisors is an integer number (28014576).

Almost surely, 2^421724240 is an apocalyptic number.

421724240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421724240 is an abundant number, since it is smaller than the sum of its proper divisors (698858800).

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

421724240 is a wasteful number, since it uses less digits than its factorization.

421724240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753099 (or 753093 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 26.

The square root of 421724240 is about 20535.9255939439. The cubic root of 421724240 is about 749.9106500966.

The spelling of 421724240 in words is "four hundred twenty-one million, seven hundred twenty-four thousand, two hundred forty".