42420551 has 8 divisors (see below), whose sum is σ = 43296000. Its totient is φ = 41553720.

The previous prime is 42420541. The next prime is 42420571. The reversal of 42420551 is 15502424.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42420551 - 2¹⁸ = 42158407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42420541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8300 + ... + 12398.

It is an arithmetic number, because the mean of its divisors is an integer number (5412000).

Almost surely, 2^42420551 is an apocalyptic number.

42420551 is a deficient number, since it is larger than the sum of its proper divisors (875449).

42420551 is a wasteful number, since it uses less digits than its factorization.

42420551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4309.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 42420551 is about 6513.1060946372. The cubic root of 42420551 is about 348.7590091154.

Adding to 42420551 its reverse (15502424), we get a palindrome (57922975).

The spelling of 42420551 in words is "forty-two million, four hundred twenty thousand, five hundred fifty-one".