1187951649938 has 8 divisors (see below), whose sum is σ = 1782044161932. Its totient is φ = 593936929296.

The previous prime is 1187951649887. The next prime is 1187951649979. The reversal of 1187951649938 is 8399461597811.

It can be written as a sum of positive squares in 2 ways, for example, as 1140596232169 + 47355417769 = 1067987^2 + 217613^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1187951649938² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19409645 + ... + 19470752.

Almost surely, 2^{1187951649938} is an apocalyptic number.

1187951649938 is a deficient number, since it is larger than the sum of its proper divisors (594092511994).

1187951649938 is a wasteful number, since it uses less digits than its factorization.

1187951649938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38895676.

The product of its digits is 117573120, while the sum is 71.

The spelling of 1187951649938 in words is "one trillion, one hundred eighty-seven billion, nine hundred fifty-one million, six hundred forty-nine thousand, nine hundred thirty-eight".