1181957916 has 24 divisors (see below), whose sum is σ = 2765113344. Its totient is φ = 392955760.

The previous prime is 1181957911. The next prime is 1181957923. The reversal of 1181957916 is 6197591811.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181957911) 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 7 ways as a sum of consecutive naturals, for example, 123990 + ... + 133181.

It is an arithmetic number, because the mean of its divisors is an integer number (115213056).

Almost surely, 2^1181957916 is an apocalyptic number.

It is an amenable number.

1181957916 is an abundant number, since it is smaller than the sum of its proper divisors (1583155428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1181957916 is a wasteful number, since it uses less digits than its factorization.

1181957916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257561 (or 257559 counting only the distinct ones).

The product of its digits is 136080, while the sum is 48.

The square root of 1181957916 is about 34379.6148320484. The cubic root of 1181957916 is about 1057.3059378206.

The spelling of 1181957916 in words is "one billion, one hundred eighty-one million, nine hundred fifty-seven thousand, nine hundred sixteen".