42540669 has 6 divisors (see below), whose sum is σ = 61447646. Its totient is φ = 28360440.

The previous prime is 42540637. The next prime is 42540679. The reversal of 42540669 is 96604524.

It can be written as a sum of positive squares in only one way, i.e., 41757444 + 783225 = 6462^2 + 885^2 .

It is not a de Polignac number, because 42540669 - 2⁵ = 42540637 is a prime.

It is a super-2 number, since 2×42540669² = 3619417037935122, 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 (42540679) 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, 2363362 + ... + 2363379.

Almost surely, 2^42540669 is an apocalyptic number.

It is an amenable number.

42540669 is a deficient number, since it is larger than the sum of its proper divisors (18906977).

42540669 is a wasteful number, since it uses less digits than its factorization.

42540669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4726747 (or 4726744 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 42540669 is about 6522.3208292754. The cubic root of 42540669 is about 349.0878808146.

The spelling of 42540669 in words is "forty-two million, five hundred forty thousand, six hundred sixty-nine".