2605000042 has 4 divisors (see below), whose sum is σ = 3907500066. Its totient is φ = 1302500020.

The previous prime is 2605000003. The next prime is 2605000043. The reversal of 2605000042 is 2400005062.

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

It can be written as a sum of positive squares in only one way, i.e., 1323431641 + 1281568401 = 36379^2 + 35799^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2604999983 and 2605000019.

It is not an unprimeable number, because it can be changed into a prime (2605000043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 651250009 + ... + 651250012.

Almost surely, 2^2605000042 is an apocalyptic number.

2605000042 is a deficient number, since it is larger than the sum of its proper divisors (1302500024).

2605000042 is a wasteful number, since it uses less digits than its factorization.

2605000042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1302500023.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 2605000042 is about 51039.2010321478. The cubic root of 2605000042 is about 1375.9497644389.

The spelling of 2605000042 in words is "two billion, six hundred five million, forty-two", and thus it is an aban number.