88888421 has 4 divisors (see below), whose sum is σ = 90779712. Its totient is φ = 86997132.

The previous prime is 88888391. The next prime is 88888447. The reversal of 88888421 is 12488888.

88888421 = 415² + 416² + ... + 696².

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 88888421 - 2¹⁸ = 88626277 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 1891243 = 88888421 / (8 + 8 + 8 + 8 + 8 + 4 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (88888021) 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, 945575 + ... + 945668.

It is an arithmetic number, because the mean of its divisors is an integer number (22694928).

Almost surely, 2^88888421 is an apocalyptic number.

It is an amenable number.

88888421 is a deficient number, since it is larger than the sum of its proper divisors (1891291).

88888421 is a wasteful number, since it uses less digits than its factorization.

88888421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1891290.

The product of its digits is 262144, while the sum is 47.

The square root of 88888421 is about 9428.0656022325. The cubic root of 88888421 is about 446.2878503361.

The spelling of 88888421 in words is "eighty-eight million, eight hundred eighty-eight thousand, four hundred twenty-one".