421203440 has 40 divisors (see below), whose sum is σ = 1119199200. Its totient is φ = 144412416.

The previous prime is 421203437. The next prime is 421203443. The reversal of 421203440 is 44302124.

It is an interprime number because it is at equal distance from previous prime (421203437) and next prime (421203443).

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

It is a super-3 number, since 3×421203440³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421203443) 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, 375515 + ... + 376634.

It is an arithmetic number, because the mean of its divisors is an integer number (27979980).

Almost surely, 2^421203440 is an apocalyptic number.

421203440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421203440 is an abundant number, since it is smaller than the sum of its proper divisors (697995760).

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

421203440 is a wasteful number, since it uses less digits than its factorization.

421203440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752169 (or 752163 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 421203440 is about 20523.2414593797. The cubic root of 421203440 is about 749.6018271671.

Adding to 421203440 its reverse (44302124), we get a palindrome (465505564).

The spelling of 421203440 in words is "four hundred twenty-one million, two hundred three thousand, four hundred forty".