1388575946 has 16 divisors (see below), whose sum is σ = 2259177480. Its totient is φ = 637509120.

The previous prime is 1388575939. The next prime is 1388575949. The reversal of 1388575946 is 6495758831.

It can be written as a sum of positive squares in 4 ways, for example, as 1326780625 + 61795321 = 36425^2 + 7861^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1388575891 and 1388575900.

It is not an unprimeable number, because it can be changed into a prime (1388575949) by changing a digit.

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, 496661 + ... + 499448.

Almost surely, 2^1388575946 is an apocalyptic number.

1388575946 is a deficient number, since it is larger than the sum of its proper divisors (870601534).

1388575946 is a wasteful number, since it uses less digits than its factorization.

1388575946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996169.

The product of its digits is 7257600, while the sum is 56.

The square root of 1388575946 is about 37263.6008190298. The cubic root of 1388575946 is about 1115.6377794632.

The spelling of 1388575946 in words is "one billion, three hundred eighty-eight million, five hundred seventy-five thousand, nine hundred forty-six".