42406551 has 64 divisors (see below), whose sum is σ = 74856960. Its totient is φ = 23431680.

The previous prime is 42406547. The next prime is 42406577. The reversal of 42406551 is 15560424.

42406551 is a `hidden beast` number, since 4 + 2 + 4 + 0 + 655 + 1 = 666.

It is not a de Polignac number, because 42406551 - 2² = 42406547 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42406501) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 186700 + ... + 186926.

It is an arithmetic number, because the mean of its divisors is an integer number (1169640).

Almost surely, 2^42406551 is an apocalyptic number.

42406551 is a deficient number, since it is larger than the sum of its proper divisors (32450409).

42406551 is a wasteful number, since it uses less digits than its factorization.

42406551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 42406551 is about 6512.0312499250. The cubic root of 42406551 is about 348.7206380645.

Adding to 42406551 its reverse (15560424), we get a palindrome (57966975).

The spelling of 42406551 in words is "forty-two million, four hundred six thousand, five hundred fifty-one".