1388690801 has 2 divisors, whose sum is σ = 1388690802. Its totient is φ = 1388690800.

The previous prime is 1388690761. The next prime is 1388690827. The reversal of 1388690801 is 1080968831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1045552225 + 343138576 = 32335^2 + 18524^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1388690801 is a prime.

It is not a weakly prime, because it can be changed into another prime (1388690851) 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 as a sum of consecutive naturals, namely, 694345400 + 694345401.

It is an arithmetic number, because the mean of its divisors is an integer number (694345401).

Almost surely, 2^1388690801 is an apocalyptic number.

It is an amenable number.

1388690801 is a deficient number, since it is larger than the sum of its proper divisors (1).

1388690801 is an equidigital number, since it uses as much as digits as its factorization.

1388690801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 44.

The square root of 1388690801 is about 37265.1419023194. The cubic root of 1388690801 is about 1115.6685383244.

The spelling of 1388690801 in words is "one billion, three hundred eighty-eight million, six hundred ninety thousand, eight hundred one".