1187913943 has 4 divisors (see below), whose sum is σ = 1187983120. Its totient is φ = 1187844768.

The previous prime is 1187913941. The next prime is 1187913977. The reversal of 1187913943 is 3493197811.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3493197811 = 6379 ⋅547609.

It is a cyclic number.

It is not a de Polignac number, because 1187913943 - 2¹ = 1187913941 is a prime.

It is a super-2 number, since 2×1187913943² = 2822279071947614498, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1187913893 and 1187913902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1187913941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12943 + ... + 50431.

It is an arithmetic number, because the mean of its divisors is an integer number (296995780).

Almost surely, 2^1187913943 is an apocalyptic number.

1187913943 is a deficient number, since it is larger than the sum of its proper divisors (69177).

1187913943 is an equidigital number, since it uses as much as digits as its factorization.

1187913943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69176.

The product of its digits is 163296, while the sum is 46.

The square root of 1187913943 is about 34466.1274732164. The cubic root of 1187913943 is about 1059.0789266481.

The spelling of 1187913943 in words is "one billion, one hundred eighty-seven million, nine hundred thirteen thousand, nine hundred forty-three".