42404551 has 12 divisors (see below), whose sum is σ = 49456848. Its totient is φ = 36251712.

The previous prime is 42404543. The next prime is 42404603. The reversal of 42404551 is 15540424.

It is a happy number.

It is not a de Polignac number, because 42404551 - 2³ = 42404543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42404251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22975 + ... + 24751.

It is an arithmetic number, because the mean of its divisors is an integer number (4121404).

Almost surely, 2^42404551 is an apocalyptic number.

42404551 is a deficient number, since it is larger than the sum of its proper divisors (7052297).

42404551 is a wasteful number, since it uses less digits than its factorization.

42404551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2278 (or 2271 counting only the distinct ones).

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

The square root of 42404551 is about 6511.8776861977. The cubic root of 42404551 is about 348.7151557964.

Adding to 42404551 its reverse (15540424), we get a palindrome (57944975).

The spelling of 42404551 in words is "forty-two million, four hundred four thousand, five hundred fifty-one".