1388400308 has 6 divisors (see below), whose sum is σ = 2429700546. Its totient is φ = 694200152.

The previous prime is 1388400289. The next prime is 1388400337. The reversal of 1388400308 is 8030048831.

It can be written as a sum of positive squares in only one way, i.e., 1085570704 + 302829604 = 32948^2 + 17402^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173550035 + ... + 173550042.

It is an arithmetic number, because the mean of its divisors is an integer number (404950091).

Almost surely, 2^1388400308 is an apocalyptic number.

It is an amenable number.

1388400308 is a deficient number, since it is larger than the sum of its proper divisors (1041300238).

1388400308 is a wasteful number, since it uses less digits than its factorization.

1388400308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347100081 (or 347100079 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 1388400308 is about 37261.2440479381. The cubic root of 1388400308 is about 1115.5907392680.

The spelling of 1388400308 in words is "one billion, three hundred eighty-eight million, four hundred thousand, three hundred eight".