42402544 has 40 divisors (see below), whose sum is σ = 86458752. Its totient is φ = 20117760.

The previous prime is 42402523. The next prime is 42402551. The reversal of 42402544 is 44520424.

It is a happy number.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25482 + ... + 27094.

Almost surely, 2^42402544 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 42402544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43229376).

42402544 is an abundant number, since it is smaller than the sum of its proper divisors (44056208).

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

42402544 is a wasteful number, since it uses less digits than its factorization.

42402544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1705 (or 1699 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 25.

The square root of 42402544 is about 6511.7235813569. The cubic root of 42402544 is about 348.7096541672.

Adding to 42402544 its reverse (44520424), we get a palindrome (86922968).

The spelling of 42402544 in words is "forty-two million, four hundred two thousand, five hundred forty-four".