642240043 has 4 divisors (see below), whose sum is σ = 659597920. Its totient is φ = 624882168.

The previous prime is 642240041. The next prime is 642240047. The reversal of 642240043 is 340042246.

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

It is a cyclic number.

It is not a de Polignac number, because 642240043 - 2¹ = 642240041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642240041) 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, 8678883 + ... + 8678956.

It is an arithmetic number, because the mean of its divisors is an integer number (164899480).

Almost surely, 2^642240043 is an apocalyptic number.

642240043 is a deficient number, since it is larger than the sum of its proper divisors (17357877).

642240043 is a wasteful number, since it uses less digits than its factorization.

642240043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17357876.

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 642240043 is about 25342.4553467102. The cubic root of 642240043 is about 862.7781274288.

Adding to 642240043 its reverse (340042246), we get a palindrome (982282289).

The spelling of 642240043 in words is "six hundred forty-two million, two hundred forty thousand, forty-three".