1388657902 has 32 divisors (see below), whose sum is σ = 2241043200. Its totient is φ = 643406400.

The previous prime is 1388657839. The next prime is 1388657909. The reversal of 1388657902 is 2097568831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388657909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 351474 + ... + 355402.

It is an arithmetic number, because the mean of its divisors is an integer number (70032600).

Almost surely, 2^1388657902 is an apocalyptic number.

1388657902 is a deficient number, since it is larger than the sum of its proper divisors (852385298).

1388657902 is a wasteful number, since it uses less digits than its factorization.

1388657902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4152.

The product of its (nonzero) digits is 725760, while the sum is 49.

The square root of 1388657902 is about 37264.7004818233. The cubic root of 1388657902 is about 1115.6597279473.

The spelling of 1388657902 in words is "one billion, three hundred eighty-eight million, six hundred fifty-seven thousand, nine hundred two".