1388890279 has 8 divisors (see below), whose sum is σ = 1621075968. Its totient is φ = 1165147800.

The previous prime is 1388890277. The next prime is 1388890319. The reversal of 1388890279 is 9720988831.

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 1388890279 - 2¹ = 1388890277 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 (1388890271) 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, 2110447 + ... + 2111104.

It is an arithmetic number, because the mean of its divisors is an integer number (202634496).

Almost surely, 2^1388890279 is an apocalyptic number.

1388890279 is a deficient number, since it is larger than the sum of its proper divisors (232185689).

1388890279 is an equidigital number, since it uses as much as digits as its factorization.

1388890279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4221605.

The product of its (nonzero) digits is 1741824, while the sum is 55.

The square root of 1388890279 is about 37267.8182752895. The cubic root of 1388890279 is about 1115.7219557046.

The spelling of 1388890279 in words is "one billion, three hundred eighty-eight million, eight hundred ninety thousand, two hundred seventy-nine".