42040655 has 4 divisors (see below), whose sum is σ = 50448792. Its totient is φ = 33632520.

The previous prime is 42040637. The next prime is 42040667. The reversal of 42040655 is 55604024.

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

It is not a de Polignac number, because 42040655 - 2¹⁰ = 42039631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4204061 + ... + 4204070.

It is an arithmetic number, because the mean of its divisors is an integer number (12612198).

Almost surely, 2^42040655 is an apocalyptic number.

42040655 is a deficient number, since it is larger than the sum of its proper divisors (8408137).

42040655 is an equidigital number, since it uses as much as digits as its factorization.

42040655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8408136.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 42040655 is about 6483.8765410825. The cubic root of 42040655 is about 347.7147853540.

Adding to 42040655 its reverse (55604024), we get a palindrome (97644679).

The spelling of 42040655 in words is "forty-two million, forty thousand, six hundred fifty-five".