1978990741724 has 6 divisors (see below), whose sum is σ = 3463233798024. Its totient is φ = 989495370860.

The previous prime is 1978990741723. The next prime is 1978990741727. The reversal of 1978990741724 is 4271470998791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978990741723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247373842712 + ... + 247373842719.

It is an arithmetic number, because the mean of its divisors is an integer number (577205633004).

Almost surely, 2^{1978990741724} is an apocalyptic number.

It is an amenable number.

1978990741724 is a deficient number, since it is larger than the sum of its proper divisors (1484243056300).

1978990741724 is a wasteful number, since it uses less digits than its factorization.

1978990741724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494747685435 (or 494747685433 counting only the distinct ones).

The product of its (nonzero) digits is 64012032, while the sum is 68.

The spelling of 1978990741724 in words is "one trillion, nine hundred seventy-eight billion, nine hundred ninety million, seven hundred forty-one thousand, seven hundred twenty-four".