1388728214 has 8 divisors (see below), whose sum is σ = 2084790960. Its totient is φ = 693797896.

The previous prime is 1388728199. The next prime is 1388728217. The reversal of 1388728214 is 4128278831.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388728217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280034 + ... + 284949.

It is an arithmetic number, because the mean of its divisors is an integer number (260598870).

Almost surely, 2^1388728214 is an apocalyptic number.

1388728214 is a deficient number, since it is larger than the sum of its proper divisors (696062746).

1388728214 is a wasteful number, since it uses less digits than its factorization.

1388728214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566214.

The product of its digits is 172032, while the sum is 44.

The square root of 1388728214 is about 37265.6438828044. The cubic root of 1388728214 is about 1115.6785573851.

The spelling of 1388728214 in words is "one billion, three hundred eighty-eight million, seven hundred twenty-eight thousand, two hundred fourteen".