1949426879 has 2 divisors, whose sum is σ = 1949426880. Its totient is φ = 1949426878.

The previous prime is 1949426861. The next prime is 1949426903. The reversal of 1949426879 is 9786249491.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1949426879 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1949426819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 974713439 + 974713440.

It is an arithmetic number, because the mean of its divisors is an integer number (974713440).

Almost surely, 2^1949426879 is an apocalyptic number.

1949426879 is a deficient number, since it is larger than the sum of its proper divisors (1).

1949426879 is an equidigital number, since it uses as much as digits as its factorization.

1949426879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 59.

The square root of 1949426879 is about 44152.3145372924. The cubic root of 1949426879 is about 1249.2105690640.

The spelling of 1949426879 in words is "one billion, nine hundred forty-nine million, four hundred twenty-six thousand, eight hundred seventy-nine".