42420681 has 12 divisors (see below), whose sum is σ = 62279620. Its totient is φ = 27816480.

The previous prime is 42420659. The next prime is 42420683. The reversal of 42420681 is 18602424.

It can be written as a sum of positive squares in 2 ways, for example, as 11451456 + 30969225 = 3384^2 + 5565^2 .

It is not a de Polignac number, because 42420681 - 2¹⁵ = 42387913 is a prime.

It is a super-2 number, since 2×42420681² = 3599028353007522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42420683) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38086 + ... + 39183.

Almost surely, 2^42420681 is an apocalyptic number.

It is an amenable number.

42420681 is a deficient number, since it is larger than the sum of its proper divisors (19858939).

42420681 is a wasteful number, since it uses less digits than its factorization.

42420681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77336 (or 77333 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 42420681 is about 6513.1160745069. The cubic root of 42420681 is about 348.7593653784.

The spelling of 42420681 in words is "forty-two million, four hundred twenty thousand, six hundred eighty-one".