1388490490 has 16 divisors (see below), whose sum is σ = 2566831752. Its totient is φ = 540385344.

The previous prime is 1388490469. The next prime is 1388490503. The reversal of 1388490490 is 940948831.

It can be written as a sum of positive squares in 4 ways, for example, as 1374852241 + 13638249 = 37079^2 + 3693^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1388490490.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1875969 + ... + 1876708.

Almost surely, 2^1388490490 is an apocalyptic number.

1388490490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1388490490 is a deficient number, since it is larger than the sum of its proper divisors (1178341262).

1388490490 is a wasteful number, since it uses less digits than its factorization.

1388490490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3752721.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 1388490490 is about 37262.4541596498. The cubic root of 1388490490 is about 1115.6148927309.

The spelling of 1388490490 in words is "one billion, three hundred eighty-eight million, four hundred ninety thousand, four hundred ninety".