1394442779 has 2 divisors, whose sum is σ = 1394442780. Its totient is φ = 1394442778.

The previous prime is 1394442761. The next prime is 1394442823. The reversal of 1394442779 is 9772444931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1394442779 - 2⁸ = 1394442523 is a prime.

It is not a weakly prime, because it can be changed into another prime (1394442719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 697221389 + 697221390.

It is an arithmetic number, because the mean of its divisors is an integer number (697221390).

Almost surely, 2^1394442779 is an apocalyptic number.

1394442779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1394442779 is an equidigital number, since it uses as much as digits as its factorization.

1394442779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 50.

The square root of 1394442779 is about 37342.2385376131. The cubic root of 1394442779 is about 1117.2067883630.

The spelling of 1394442779 in words is "one billion, three hundred ninety-four million, four hundred forty-two thousand, seven hundred seventy-nine".