42240402 has 24 divisors (see below), whose sum is σ = 91690560. Its totient is φ = 14054040.

The previous prime is 42240391. The next prime is 42240409. The reversal of 42240402 is 20404224.

It is a super-2 number, since 2×42240402² = 3568503122243208, which contains 22 as substring.

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

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (42240409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9499 + ... + 13217.

It is an arithmetic number, because the mean of its divisors is an integer number (3820440).

Almost surely, 2^42240402 is an apocalyptic number.

42240402 is an abundant number, since it is smaller than the sum of its proper divisors (49450158).

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

42240402 is a wasteful number, since it uses less digits than its factorization.

42240402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4358 (or 4355 counting only the distinct ones).

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

The square root of 42240402 is about 6499.2616503723. The cubic root of 42240402 is about 348.2646124567.

Adding to 42240402 its reverse (20404224), we get a palindrome (62644626).

The spelling of 42240402 in words is "forty-two million, two hundred forty thousand, four hundred two".