42290388 has 72 divisors (see below), whose sum is σ = 122810688. Its totient is φ = 12019968.

The previous prime is 42290387. The next prime is 42290401. The reversal of 42290388 is 88309224.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42290387) 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 23 ways as a sum of consecutive naturals, for example, 71020 + ... + 71612.

It is an arithmetic number, because the mean of its divisors is an integer number (1705704).

Almost surely, 2^42290388 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 42290388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61405344).

42290388 is an abundant number, since it is smaller than the sum of its proper divisors (80520300).

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

42290388 is a wasteful number, since it uses less digits than its factorization.

42290388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893 (or 888 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 42290388 is about 6503.1060271227. The cubic root of 42290388 is about 348.4019335345.

The spelling of 42290388 in words is "forty-two million, two hundred ninety thousand, three hundred eighty-eight".