1187121798434 has 48 divisors (see below), whose sum is σ = 2118876157440. Its totient is φ = 495484994400.

The previous prime is 1187121798347. The next prime is 1187121798437. The reversal of 1187121798434 is 4348971217811.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1187121798434.

It is not an unprimeable number, because it can be changed into a prime (1187121798437) 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 23 ways as a sum of consecutive naturals, for example, 386924 + ... + 1588695.

It is an arithmetic number, because the mean of its divisors is an integer number (44143253280).

Almost surely, 2^{1187121798434} is an apocalyptic number.

1187121798434 is a deficient number, since it is larger than the sum of its proper divisors (931754359006).

1187121798434 is a wasteful number, since it uses less digits than its factorization.

1187121798434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1975847 (or 1975836 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 56.

The spelling of 1187121798434 in words is "one trillion, one hundred eighty-seven billion, one hundred twenty-one million, seven hundred ninety-eight thousand, four hundred thirty-four".