421534240 has 48 divisors (see below), whose sum is σ = 997398360. Its totient is φ = 168355840.

The previous prime is 421534231. The next prime is 421534241. The reversal of 421534240 is 42435124.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 306530064 + 115004176 = 17508^2 + 10724^2 .

It is a super-2 number, since 2×421534240² = 355382230984755200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (421534241) 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, 129756 + ... + 132964.

Almost surely, 2^421534240 is an apocalyptic number.

421534240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421534240 is an abundant number, since it is smaller than the sum of its proper divisors (575864120).

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

421534240 is a wasteful number, since it uses less digits than its factorization.

421534240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4045 (or 4037 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 421534240 is about 20531.2990334270. The cubic root of 421534240 is about 749.7980137551.

Adding to 421534240 its reverse (42435124), we get a palindrome (463969364).

The spelling of 421534240 in words is "four hundred twenty-one million, five hundred thirty-four thousand, two hundred forty".