1378021699 has 2 divisors, whose sum is σ = 1378021700. Its totient is φ = 1378021698.

The previous prime is 1378021651. The next prime is 1378021741. The reversal of 1378021699 is 9961208731.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1378021699 - 2²¹ = 1375924547 is a prime.

It is not a weakly prime, because it can be changed into another prime (1378021199) by changing a digit.

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 as a sum of consecutive naturals, namely, 689010849 + 689010850.

It is an arithmetic number, because the mean of its divisors is an integer number (689010850).

Almost surely, 2^1378021699 is an apocalyptic number.

1378021699 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378021699 is an equidigital number, since it uses as much as digits as its factorization.

1378021699 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 1378021699 is about 37121.7146559800. The cubic root of 1378021699 is about 1112.8040188179.

The spelling of 1378021699 in words is "one billion, three hundred seventy-eight million, twenty-one thousand, six hundred ninety-nine".