42661957 has 4 divisors (see below), whose sum is σ = 45943660. Its totient is φ = 39380256.

The previous prime is 42661943. The next prime is 42661961. The reversal of 42661957 is 75916624.

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 20061441 + 22600516 = 4479^2 + 4754^2 .

It is a cyclic number.

It is not a de Polignac number, because 42661957 - 2¹¹ = 42659909 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 (42661057) 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, 1640832 + ... + 1640857.

It is an arithmetic number, because the mean of its divisors is an integer number (11485915).

Almost surely, 2^42661957 is an apocalyptic number.

It is an amenable number.

42661957 is a deficient number, since it is larger than the sum of its proper divisors (3281703).

42661957 is a wasteful number, since it uses less digits than its factorization.

42661957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3281702.

The product of its digits is 90720, while the sum is 40.

The square root of 42661957 is about 6531.6121287168. The cubic root of 42661957 is about 349.4193283189.

The spelling of 42661957 in words is "forty-two million, six hundred sixty-one thousand, nine hundred fifty-seven".