1388901389 has 2 divisors, whose sum is σ = 1388901390. Its totient is φ = 1388901388.

The previous prime is 1388901383. The next prime is 1388901403. The reversal of 1388901389 is 9831098831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1206381289 + 182520100 = 34733^2 + 13510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1388901389 is a prime.

It is a super-2 number, since 2×1388901389² = 3858094136732258642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1388901383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694450694 + 694450695.

It is an arithmetic number, because the mean of its divisors is an integer number (694450695).

Almost surely, 2^1388901389 is an apocalyptic number.

It is an amenable number.

1388901389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1388901389 is an equidigital number, since it uses as much as digits as its factorization.

1388901389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 50.

The square root of 1388901389 is about 37267.9673312082. The cubic root of 1388901389 is about 1115.7249306547.

The spelling of 1388901389 in words is "one billion, three hundred eighty-eight million, nine hundred one thousand, three hundred eighty-nine".