1390026888 has 24 divisors (see below), whose sum is σ = 3764656350. Its totient is φ = 463342272.

The previous prime is 1390026881. The next prime is 1390026889. The reversal of 1390026888 is 8886200931.

It can be written as a sum of positive squares in only one way, i.e., 884586564 + 505440324 = 29742^2 + 22482^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (1390026881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9652893 + ... + 9653036.

Almost surely, 2^1390026888 is an apocalyptic number.

1390026888 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1390026888 is an abundant number, since it is smaller than the sum of its proper divisors (2374629462).

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

1390026888 is a wasteful number, since it uses less digits than its factorization.

1390026888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19305941 (or 19305934 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 1390026888 is about 37283.0643590357. The cubic root of 1390026888 is about 1116.0262259224.

The spelling of 1390026888 in words is "one billion, three hundred ninety million, twenty-six thousand, eight hundred eighty-eight".