42420402 has 32 divisors (see below), whose sum is σ = 95145600. Its totient is φ = 14008464.

The previous prime is 42420401. The next prime is 42420419. The reversal of 42420402 is 20402424.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (42420401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2283 + ... + 9489.

It is an arithmetic number, because the mean of its divisors is an integer number (2973300).

Almost surely, 2^42420402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42420402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47572800).

42420402 is an abundant number, since it is smaller than the sum of its proper divisors (52725198).

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

42420402 is a wasteful number, since it uses less digits than its factorization.

42420402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7327 (or 7321 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 42420402 is about 6513.0946561523. The cubic root of 42420402 is about 348.7586007822.

Adding to 42420402 its reverse (20402424), we get a palindrome (62822826).

The spelling of 42420402 in words is "forty-two million, four hundred twenty thousand, four hundred two".