1999157741 has 16 divisors (see below), whose sum is σ = 2320410240. Its totient is φ = 1687012800.

The previous prime is 1999157651. The next prime is 1999157761. The reversal of 1999157741 is 1477519991.

It is a cyclic number.

It is not a de Polignac number, because 1999157741 - 2¹⁰ = 1999156717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999157761) 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 in 15 ways as a sum of consecutive naturals, for example, 118655 + ... + 134451.

It is an arithmetic number, because the mean of its divisors is an integer number (145025640).

Almost surely, 2^1999157741 is an apocalyptic number.

It is an amenable number.

1999157741 is a deficient number, since it is larger than the sum of its proper divisors (321252499).

1999157741 is a wasteful number, since it uses less digits than its factorization.

1999157741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16084.

The product of its digits is 714420, while the sum is 53.

The square root of 1999157741 is about 44711.9418164767. The cubic root of 1999157741 is about 1259.7441617544.

The spelling of 1999157741 in words is "one billion, nine hundred ninety-nine million, one hundred fifty-seven thousand, seven hundred forty-one".