1388131394 has 16 divisors (see below), whose sum is σ = 2243072832. Its totient is φ = 640474128.

The previous prime is 1388131387. The next prime is 1388131403. The reversal of 1388131394 is 4931318831.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104027 + ... + 116609.

It is an arithmetic number, because the mean of its divisors is an integer number (140192052).

Almost surely, 2^1388131394 is an apocalyptic number.

1388131394 is a deficient number, since it is larger than the sum of its proper divisors (854941438).

1388131394 is a wasteful number, since it uses less digits than its factorization.

1388131394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16841.

The product of its digits is 62208, while the sum is 41.

The square root of 1388131394 is about 37257.6353785368. The cubic root of 1388131394 is about 1115.5187097684.

The spelling of 1388131394 in words is "one billion, three hundred eighty-eight million, one hundred thirty-one thousand, three hundred ninety-four".