42899661 has 24 divisors (see below), whose sum is σ = 71008704. Its totient is φ = 24448320.

The previous prime is 42899657. The next prime is 42899683. The reversal of 42899661 is 16699824.

It is a happy number.

42899661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42899661 - 2² = 42899657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42899611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32170 + ... + 33476.

It is an arithmetic number, because the mean of its divisors is an integer number (2958696).

Almost surely, 2^42899661 is an apocalyptic number.

It is an amenable number.

42899661 is a deficient number, since it is larger than the sum of its proper divisors (28109043).

42899661 is a wasteful number, since it uses less digits than its factorization.

42899661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841 (or 1838 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 42899661 is about 6549.7832788574. The cubic root of 42899661 is about 350.0670919002.

The spelling of 42899661 in words is "forty-two million, eight hundred ninety-nine thousand, six hundred sixty-one".