42888421 has 4 divisors (see below), whose sum is σ = 42991200. Its totient is φ = 42785644.

The previous prime is 42888409. The next prime is 42888431. The reversal of 42888421 is 12488824.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42888421 - 2⁹ = 42887909 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 (42888431) 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, 50761 + ... + 51598.

It is an arithmetic number, because the mean of its divisors is an integer number (10747800).

Almost surely, 2^42888421 is an apocalyptic number.

It is an amenable number.

42888421 is a deficient number, since it is larger than the sum of its proper divisors (102779).

42888421 is a wasteful number, since it uses less digits than its factorization.

42888421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102778.

The product of its digits is 32768, while the sum is 37.

The square root of 42888421 is about 6548.9251789893. The cubic root of 42888421 is about 350.0365159180.

The spelling of 42888421 in words is "forty-two million, eight hundred eighty-eight thousand, four hundred twenty-one".