1988215655 has 8 divisors (see below), whose sum is σ = 2387472192. Its totient is φ = 1589496928.

The previous prime is 1988215643. The next prime is 1988215681. The reversal of 1988215655 is 5565128891.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1988215655 - 2¹⁴ = 1988199271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126272 + ... + 141141.

It is an arithmetic number, because the mean of its divisors is an integer number (298434024).

Almost surely, 2^1988215655 is an apocalyptic number.

1988215655 is a deficient number, since it is larger than the sum of its proper divisors (399256537).

1988215655 is a wasteful number, since it uses less digits than its factorization.

1988215655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268905.

The product of its digits is 864000, while the sum is 50.

The square root of 1988215655 is about 44589.4119158349. The cubic root of 1988215655 is about 1257.4416163622.

The spelling of 1988215655 in words is "one billion, nine hundred eighty-eight million, two hundred fifteen thousand, six hundred fifty-five".