1388678002 has 4 divisors (see below), whose sum is σ = 2083017006. Its totient is φ = 694339000.

The previous prime is 1388677999. The next prime is 1388678003. The reversal of 1388678002 is 2008768831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1386743121 + 1934881 = 37239^2 + 1391^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1388678002.

It is not an unprimeable number, because it can be changed into a prime (1388678003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347169499 + ... + 347169502.

Almost surely, 2^1388678002 is an apocalyptic number.

1388678002 is a deficient number, since it is larger than the sum of its proper divisors (694339004).

1388678002 is an equidigital number, since it uses as much as digits as its factorization.

1388678002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694339003.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 1388678002 is about 37264.9701730727. The cubic root of 1388678002 is about 1115.6651107591.

The spelling of 1388678002 in words is "one billion, three hundred eighty-eight million, six hundred seventy-eight thousand, two".