1388274906 has 8 divisors (see below), whose sum is σ = 2776549824. Its totient is φ = 462758300.

The previous prime is 1388274889. The next prime is 1388274941. The reversal of 1388274906 is 6094728831.

It is a sphenic number, since it is the product of 3 distinct primes.

1388274906 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115689570 + ... + 115689581.

It is an arithmetic number, because the mean of its divisors is an integer number (347068728).

Almost surely, 2^1388274906 is an apocalyptic number.

1388274906 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1388274906 is a wasteful number, since it uses less digits than its factorization.

1388274906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231379156.

The product of its (nonzero) digits is 580608, while the sum is 48.

The square root of 1388274906 is about 37259.5612695587. The cubic root of 1388274906 is about 1115.5571510872.

It can be divided in two parts, 13882 and 74906, that added together give a palindrome (88788).

The spelling of 1388274906 in words is "one billion, three hundred eighty-eight million, two hundred seventy-four thousand, nine hundred six".