42402405 has 16 divisors (see below), whose sum is σ = 69499584. Its totient is φ = 22062720.

The previous prime is 42402377. The next prime is 42402419. The reversal of 42402405 is 50420424.

It is not a de Polignac number, because 42402405 - 2⁷ = 42402277 is a prime.

It is a congruent number.

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, 33859 + ... + 35088.

It is an arithmetic number, because the mean of its divisors is an integer number (4343724).

Almost surely, 2^42402405 is an apocalyptic number.

It is an amenable number.

42402405 is a deficient number, since it is larger than the sum of its proper divisors (27097179).

42402405 is a wasteful number, since it uses less digits than its factorization.

42402405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68996.

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 42402405 is about 6511.7129082907. The cubic root of 42402405 is about 348.7092731311.

Adding to 42402405 its reverse (50420424), we get a palindrome (92822829).

The spelling of 42402405 in words is "forty-two million, four hundred two thousand, four hundred five".