421074640 has 120 divisors (see below), whose sum is σ = 1147560480. Its totient is φ = 143265024.

The previous prime is 421074623. The next prime is 421074653. The reversal of 421074640 is 46470124.

It is a super-2 number, since 2×421074640² = 354607704902259200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 421074599 and 421074608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 638631 + ... + 639289.

It is an arithmetic number, because the mean of its divisors is an integer number (9563004).

Almost surely, 2^421074640 is an apocalyptic number.

421074640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421074640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (573780240).

421074640 is an abundant number, since it is smaller than the sum of its proper divisors (726485840).

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

421074640 is a wasteful number, since it uses less digits than its factorization.

421074640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849 (or 836 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 421074640 is about 20520.1033135801. The cubic root of 421074640 is about 749.5254123447.

The spelling of 421074640 in words is "four hundred twenty-one million, seventy-four thousand, six hundred forty".