1088390440 has 32 divisors (see below), whose sum is σ = 2474133480. Its totient is φ = 430866432.

The previous prime is 1088390431. The next prime is 1088390461. The reversal of 1088390440 is 440938801.

It can be written as a sum of positive squares in 4 ways, for example, as 446984164 + 641406276 = 21142^2 + 25326^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1088390440.

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, 136377 + ... + 144136.

Almost surely, 2^1088390440 is an apocalyptic number.

1088390440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1088390440 is an abundant number, since it is smaller than the sum of its proper divisors (1385743040).

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

1088390440 is a wasteful number, since it uses less digits than its factorization.

1088390440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280621 (or 280617 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 1088390440 is about 32990.7629496500. The cubic root of 1088390440 is about 1028.6356523317.

The spelling of 1088390440 in words is "one billion, eighty-eight million, three hundred ninety thousand, four hundred forty".