288120421 has 8 divisors (see below), whose sum is σ = 289719584. Its totient is φ = 286526160.

The previous prime is 288120419. The next prime is 288120433. The reversal of 288120421 is 124021882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 3-Lehmer number, since φ(288120421) divides (288120421-1)³.

It is a cyclic number.

It is a Carmichael number.

It is not a de Polignac number, because 288120421 - 2¹ = 288120419 is a prime.

It is a deceptive number, since it divides R_288120420.

It is a self number, because there is not a number n which added to its sum of digits gives 288120421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (288120491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187426 + ... + 188956.

It is an arithmetic number, because the mean of its divisors is an integer number (36214948).

It is a Poulet number, since it divides 2^288120420-1.

Almost surely, 2^288120421 is an apocalyptic number.

It is an amenable number.

288120421 is a deficient number, since it is larger than the sum of its proper divisors (1599163).

288120421 is a wasteful number, since it uses less digits than its factorization.

288120421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2451.

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 288120421 is about 16974.1103154186. The cubic root of 288120421 is about 660.4774789398.

The spelling of 288120421 in words is "two hundred eighty-eight million, one hundred twenty thousand, four hundred twenty-one".