42421340 has 48 divisors (see below), whose sum is σ = 96610752. Its totient is φ = 15553536.

The previous prime is 42421321. The next prime is 42421363. The reversal of 42421340 is 4312424.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42932 + ... + 43908.

It is an arithmetic number, because the mean of its divisors is an integer number (2012724).

Almost surely, 2^42421340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42421340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48305376).

42421340 is an abundant number, since it is smaller than the sum of its proper divisors (54189412).

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

42421340 is a wasteful number, since it uses less digits than its factorization.

42421340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166 (or 1164 counting only the distinct ones).

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

The square root of 42421340 is about 6513.1666645342. The cubic root of 42421340 is about 348.7611713469.

Adding to 42421340 its reverse (4312424), we get a palindrome (46733764).

The spelling of 42421340 in words is "forty-two million, four hundred twenty-one thousand, three hundred forty".