1949387057 has 4 divisors (see below), whose sum is σ = 2034143040. Its totient is φ = 1864631076.

The previous prime is 1949387039. The next prime is 1949387101. The reversal of 1949387057 is 7507839491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1949387057 - 2⁸ = 1949386801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1949387017) 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 in 3 ways as a sum of consecutive naturals, for example, 42377957 + ... + 42378002.

It is an arithmetic number, because the mean of its divisors is an integer number (508535760).

Almost surely, 2^1949387057 is an apocalyptic number.

It is an amenable number.

1949387057 is a deficient number, since it is larger than the sum of its proper divisors (84755983).

1949387057 is an equidigital number, since it uses as much as digits as its factorization.

1949387057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84755982.

The product of its (nonzero) digits is 1905120, while the sum is 53.

The square root of 1949387057 is about 44151.8635733533. The cubic root of 1949387057 is about 1249.2020629055.

The spelling of 1949387057 in words is "one billion, nine hundred forty-nine million, three hundred eighty-seven thousand, fifty-seven".