42991655 has 8 divisors (see below), whose sum is σ = 58960032. Its totient is φ = 29479968.

The previous prime is 42991651. The next prime is 42991673. The reversal of 42991655 is 55619924.

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

It is not a de Polignac number, because 42991655 - 2² = 42991651 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 (42991651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 614132 + ... + 614201.

It is an arithmetic number, because the mean of its divisors is an integer number (7370004).

Almost surely, 2^42991655 is an apocalyptic number.

42991655 is a deficient number, since it is larger than the sum of its proper divisors (15968377).

42991655 is a wasteful number, since it uses less digits than its factorization.

42991655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1228345.

The product of its digits is 97200, while the sum is 41.

The square root of 42991655 is about 6556.8021931426. The cubic root of 42991655 is about 350.3171411175.

The spelling of 42991655 in words is "forty-two million, nine hundred ninety-one thousand, six hundred fifty-five".