1999947157 has 16 divisors (see below), whose sum is σ = 2225760768. Its totient is φ = 1785268800.

The previous prime is 1999947143. The next prime is 1999947211. The reversal of 1999947157 is 7517499991.

It is a cyclic number.

It is not a de Polignac number, because 1999947157 - 2⁷ = 1999947029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1999947095 and 1999947104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999947107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38748 + ... + 74170.

It is an arithmetic number, because the mean of its divisors is an integer number (139110048).

Almost surely, 2^1999947157 is an apocalyptic number.

It is an amenable number.

1999947157 is a deficient number, since it is larger than the sum of its proper divisors (225813611).

1999947157 is a wasteful number, since it uses less digits than its factorization.

1999947157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35580.

The product of its digits is 6429780, while the sum is 61.

The square root of 1999947157 is about 44720.7687433926. The cubic root of 1999947157 is about 1259.9099534625.

The spelling of 1999947157 in words is "one billion, nine hundred ninety-nine million, nine hundred forty-seven thousand, one hundred fifty-seven".