42953661 has 12 divisors (see below), whose sum is σ = 65309920. Its totient is φ = 27128520.

The previous prime is 42953587. The next prime is 42953681. The reversal of 42953661 is 16635924.

It is a happy number.

42953661 is a `hidden beast` number, since 4 + 295 + 366 + 1 = 666.

It is not a de Polignac number, because 42953661 - 2⁹ = 42953149 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 (42953681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 125425 + ... + 125766.

Almost surely, 2^42953661 is an apocalyptic number.

It is an amenable number.

42953661 is a deficient number, since it is larger than the sum of its proper divisors (22356259).

42953661 is a wasteful number, since it uses less digits than its factorization.

42953661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251216 (or 251213 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 42953661 is about 6553.9042562430. The cubic root of 42953661 is about 350.2139127717.

It can be divided in two parts, 4 and 2953661, that added together give a triangular number (2953665 = T₂₄₃₀).

The spelling of 42953661 in words is "forty-two million, nine hundred fifty-three thousand, six hundred sixty-one".