42721166 has 16 divisors (see below), whose sum is σ = 67008384. Its totient is φ = 20388984.

The previous prime is 42721163. The next prime is 42721169. The reversal of 42721166 is 66112724.

It is an interprime number because it is at equal distance from previous prime (42721163) and next prime (42721169).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42721163) 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, 37481 + ... + 38603.

It is an arithmetic number, because the mean of its divisors is an integer number (4188024).

Almost surely, 2^42721166 is an apocalyptic number.

42721166 is a gapful number since it is divisible by the number (46) formed by its first and last digit.

42721166 is a deficient number, since it is larger than the sum of its proper divisors (24287218).

42721166 is a wasteful number, since it uses less digits than its factorization.

42721166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1975.

The product of its digits is 4032, while the sum is 29.

The square root of 42721166 is about 6536.1430522901. The cubic root of 42721166 is about 349.5809024455.

The spelling of 42721166 in words is "forty-two million, seven hundred twenty-one thousand, one hundred sixty-six".