421505240 has 32 divisors (see below), whose sum is σ = 1021340880. Its totient is φ = 155632512.

The previous prime is 421505239. The next prime is 421505251. The reversal of 421505240 is 42505124.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 404774 + ... + 405813.

Almost surely, 2^421505240 is an apocalyptic number.

421505240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421505240 is an abundant number, since it is smaller than the sum of its proper divisors (599835640).

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

421505240 is a wasteful number, since it uses less digits than its factorization.

421505240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810611 (or 810607 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 421505240 is about 20530.5927824795. The cubic root of 421505240 is about 749.7808189154.

The spelling of 421505240 in words is "four hundred twenty-one million, five hundred five thousand, two hundred forty".