42402439 has 4 divisors (see below), whose sum is σ = 42468624. Its totient is φ = 42336256.

The previous prime is 42402431. The next prime is 42402457. The reversal of 42402439 is 93420424.

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 42402439 - 2³ = 42402431 is a prime.

It is a Duffinian number.

42402439 is a modest number, since divided by 2439 gives 424 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42402431) 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, 32122 + ... + 33415.

It is an arithmetic number, because the mean of its divisors is an integer number (10617156).

Almost surely, 2^42402439 is an apocalyptic number.

42402439 is a deficient number, since it is larger than the sum of its proper divisors (66185).

42402439 is an equidigital number, since it uses as much as digits as its factorization.

42402439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66184.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 42402439 is about 6511.7155189704. The cubic root of 42402439 is about 348.7093663342.

The spelling of 42402439 in words is "forty-two million, four hundred two thousand, four hundred thirty-nine".