1988390747 has 12 divisors (see below), whose sum is σ = 2387641536. Its totient is φ = 1649355120.

The previous prime is 1988390707. The next prime is 1988390759. The reversal of 1988390747 is 7470938891.

It is not a de Polignac number, because 1988390747 - 2⁸ = 1988390491 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1988390692 and 1988390701.

It is not an unprimeable number, because it can be changed into a prime (1988390707) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 652988 + ... + 656025.

It is an arithmetic number, because the mean of its divisors is an integer number (198970128).

Almost surely, 2^1988390747 is an apocalyptic number.

1988390747 is a deficient number, since it is larger than the sum of its proper divisors (399250789).

1988390747 is a wasteful number, since it uses less digits than its factorization.

1988390747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309058 (or 1309051 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 56.

The square root of 1988390747 is about 44591.3752535174. The cubic root of 1988390747 is about 1257.4785274328.

The spelling of 1988390747 in words is "one billion, nine hundred eighty-eight million, three hundred ninety thousand, seven hundred forty-seven".