42661893 has 4 divisors (see below), whose sum is σ = 56882528. Its totient is φ = 28441260.

The previous prime is 42661889. The next prime is 42661903. The reversal of 42661893 is 39816624.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 42661893 - 2² = 42661889 is a prime.

It is a super-2 number, since 2×42661893² = 3640074228686898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42661393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7110313 + ... + 7110318.

It is an arithmetic number, because the mean of its divisors is an integer number (14220632).

Almost surely, 2^42661893 is an apocalyptic number.

It is an amenable number.

42661893 is a deficient number, since it is larger than the sum of its proper divisors (14220635).

42661893 is a wasteful number, since it uses less digits than its factorization.

42661893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14220634.

The product of its digits is 62208, while the sum is 39.

The square root of 42661893 is about 6531.6072294650. The cubic root of 42661893 is about 349.4191535899.

The spelling of 42661893 in words is "forty-two million, six hundred sixty-one thousand, eight hundred ninety-three".