2388989978 has 16 divisors (see below), whose sum is σ = 3665620224. Its totient is φ = 1167198480.

The previous prime is 2388989969. The next prime is 2388990047. The reversal of 2388989978 is 8799898832.

It is a super-2 number, since 2×2388989978² = 11414546229968880968, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39176 + ... + 79452.

It is an arithmetic number, because the mean of its divisors is an integer number (229101264).

Almost surely, 2^2388989978 is an apocalyptic number.

2388989978 is a deficient number, since it is larger than the sum of its proper divisors (1276630246).

2388989978 is a wasteful number, since it uses less digits than its factorization.

2388989978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40957.

The product of its digits is 125411328, while the sum is 71.

The square root of 2388989978 is about 48877.2951174674. The cubic root of 2388989978 is about 1336.8154082136.

The spelling of 2388989978 in words is "two billion, three hundred eighty-eight million, nine hundred eighty-nine thousand, nine hundred seventy-eight".