1388878242 has 32 divisors (see below), whose sum is σ = 2884814592. Its totient is φ = 445438224.

The previous prime is 1388878241. The next prime is 1388878289. The reversal of 1388878242 is 2428788831.

It is a super-2 number, since 2×1388878242² = 3857965542202021128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1388878241) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 22888 + ... + 57459.

It is an arithmetic number, because the mean of its divisors is an integer number (90150456).

Almost surely, 2^1388878242 is an apocalyptic number.

1388878242 is an abundant number, since it is smaller than the sum of its proper divisors (1495936350).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1388878242 is a wasteful number, since it uses less digits than its factorization.

1388878242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80462.

The product of its digits is 1376256, while the sum is 51.

The square root of 1388878242 is about 37267.6567817189. The cubic root of 1388878242 is about 1115.7187325117.

The spelling of 1388878242 in words is "one billion, three hundred eighty-eight million, eight hundred seventy-eight thousand, two hundred forty-two".