1388929250 has 32 divisors (see below), whose sum is σ = 2625367680. Its totient is φ = 550167600.

The previous prime is 1388929247. The next prime is 1388929303. The reversal of 1388929250 is 529298831.

It is a junction number, because it is equal to n+sod(n) for n = 1388929195 and 1388929204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1220 + ... + 52719.

It is an arithmetic number, because the mean of its divisors is an integer number (82042740).

Almost surely, 2^1388929250 is an apocalyptic number.

1388929250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1388929250 is a deficient number, since it is larger than the sum of its proper divisors (1236438430).

1388929250 is a wasteful number, since it uses less digits than its factorization.

1388929250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54059 (or 54049 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 1388929250 is about 37268.3411221911. The cubic root of 1388929250 is about 1115.7323909887.

The spelling of 1388929250 in words is "one billion, three hundred eighty-eight million, nine hundred twenty-nine thousand, two hundred fifty".