42235861 has 6 divisors (see below), whose sum is σ = 43743362. Its totient is φ = 40778640.

The previous prime is 42235819. The next prime is 42235901. The reversal of 42235861 is 16853224.

It can be written as a sum of positive squares in 3 ways, for example, as 1976836 + 40259025 = 1406^2 + 6345^2 .

It is not a de Polignac number, because 42235861 - 2¹⁹ = 41711573 is a prime.

It is a super-2 number, since 2×42235861² = 3567735908822642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42235801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24270 + ... + 25951.

Almost surely, 2^42235861 is an apocalyptic number.

It is an amenable number.

42235861 is a deficient number, since it is larger than the sum of its proper divisors (1507501).

42235861 is an equidigital number, since it uses as much as digits as its factorization.

42235861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50279 (or 50250 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 42235861 is about 6498.9122936073. The cubic root of 42235861 is about 348.2521320966.

The spelling of 42235861 in words is "forty-two million, two hundred thirty-five thousand, eight hundred sixty-one".