42405487 has 4 divisors (see below), whose sum is σ = 42498736. Its totient is φ = 42312240.

The previous prime is 42405479. The next prime is 42405499. The reversal of 42405487 is 78450424.

It is a happy number.

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 42405487 - 2³ = 42405479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42405437) 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, 45939 + ... + 46852.

It is an arithmetic number, because the mean of its divisors is an integer number (10624684).

Almost surely, 2^42405487 is an apocalyptic number.

42405487 is a deficient number, since it is larger than the sum of its proper divisors (93249).

42405487 is an equidigital number, since it uses as much as digits as its factorization.

42405487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93248.

The product of its (nonzero) digits is 35840, while the sum is 34.

The square root of 42405487 is about 6511.9495544729. The cubic root of 42405487 is about 348.7177215194.

The spelling of 42405487 in words is "forty-two million, four hundred five thousand, four hundred eighty-seven".