42540451 has 4 divisors (see below), whose sum is σ = 42669304. Its totient is φ = 42411600.

The previous prime is 42540437. The next prime is 42540457. The reversal of 42540451 is 15404524.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42540451 - 2¹⁵ = 42507683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42540457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63930 + ... + 64591.

It is an arithmetic number, because the mean of its divisors is an integer number (10667326).

Almost surely, 2^42540451 is an apocalyptic number.

42540451 is a deficient number, since it is larger than the sum of its proper divisors (128853).

42540451 is a wasteful number, since it uses less digits than its factorization.

42540451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128852.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 42540451 is about 6522.3041174113. The cubic root of 42540451 is about 349.0872845124.

Adding to 42540451 its reverse (15404524), we get a palindrome (57944975).

The spelling of 42540451 in words is "forty-two million, five hundred forty thousand, four hundred fifty-one".