42646861 has 4 divisors (see below), whose sum is σ = 42674112. Its totient is φ = 42619612.

The previous prime is 42646859. The next prime is 42646873. The reversal of 42646861 is 16864624.

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 a cyclic number.

It is not a de Polignac number, because 42646861 - 2¹ = 42646859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42646861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42646801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11125 + ... + 14458.

It is an arithmetic number, because the mean of its divisors is an integer number (10668528).

Almost surely, 2^42646861 is an apocalyptic number.

It is an amenable number.

42646861 is a deficient number, since it is larger than the sum of its proper divisors (27251).

42646861 is a wasteful number, since it uses less digits than its factorization.

42646861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27250.

The product of its digits is 55296, while the sum is 37.

The square root of 42646861 is about 6530.4564159023. The cubic root of 42646861 is about 349.3781092654.

The spelling of 42646861 in words is "forty-two million, six hundred forty-six thousand, eight hundred sixty-one".