42940661 has 4 divisors (see below), whose sum is σ = 42981900. Its totient is φ = 42899424.

The previous prime is 42940633. The next prime is 42940663. The reversal of 42940661 is 16604924.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34000561 + 8940100 = 5831^2 + 2990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42940661 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 (42940663) 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, 19016 + ... + 21153.

It is an arithmetic number, because the mean of its divisors is an integer number (10745475).

Almost surely, 2^42940661 is an apocalyptic number.

It is an amenable number.

42940661 is a deficient number, since it is larger than the sum of its proper divisors (41239).

42940661 is a wasteful number, since it uses less digits than its factorization.

42940661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41238.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 42940661 is about 6552.9124059459. The cubic root of 42940661 is about 350.1785782574.

The spelling of 42940661 in words is "forty-two million, nine hundred forty thousand, six hundred sixty-one".