42402505 has 16 divisors (see below), whose sum is σ = 54132624. Its totient is φ = 31774720.

The previous prime is 42402499. The next prime is 42402523. The reversal of 42402505 is 50520424.

It can be written as a sum of positive squares in 8 ways, for example, as 1710864 + 40691641 = 1308^2 + 6379^2 .

It is not a de Polignac number, because 42402505 - 2⁷ = 42402377 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18735 + ... + 20875.

It is an arithmetic number, because the mean of its divisors is an integer number (3383289).

Almost surely, 2^42402505 is an apocalyptic number.

It is an amenable number.

42402505 is a deficient number, since it is larger than the sum of its proper divisors (11730119).

42402505 is a wasteful number, since it uses less digits than its factorization.

42402505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2396.

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 42402505 is about 6511.7205867574. The cubic root of 42402505 is about 348.7095472578.

Adding to 42402505 its reverse (50520424), we get a palindrome (92922929).

The spelling of 42402505 in words is "forty-two million, four hundred two thousand, five hundred five".