1269949939 has 2 divisors, whose sum is σ = 1269949940. Its totient is φ = 1269949938.

The previous prime is 1269949931. The next prime is 1269949979. The reversal of 1269949939 is 9399499621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1269949939 - 2³ = 1269949931 is a prime.

It is a super-2 number, since 2×1269949939² = 3225545695132207442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1269949931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634974969 + 634974970.

It is an arithmetic number, because the mean of its divisors is an integer number (634974970).

Almost surely, 2^1269949939 is an apocalyptic number.

1269949939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1269949939 is an equidigital number, since it uses as much as digits as its factorization.

1269949939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8503056, while the sum is 61.

The square root of 1269949939 is about 35636.3569827220. The cubic root of 1269949939 is about 1082.9179035990.

The spelling of 1269949939 in words is "one billion, two hundred sixty-nine million, nine hundred forty-nine thousand, nine hundred thirty-nine".