1988685946 has 8 divisors (see below), whose sum is σ = 3212492724. Its totient is φ = 917855040.

The previous prime is 1988685917. The next prime is 1988685947. The reversal of 1988685946 is 6495868891.

It can be written as a sum of positive squares in 2 ways, for example, as 1570933225 + 417752721 = 39635^2 + 20439^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1988685947) 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, 38243935 + ... + 38243986.

Almost surely, 2^1988685946 is an apocalyptic number.

1988685946 is a deficient number, since it is larger than the sum of its proper divisors (1223806778).

1988685946 is a wasteful number, since it uses less digits than its factorization.

1988685946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76487936.

The product of its digits is 29859840, while the sum is 64.

The square root of 1988685946 is about 44594.6851765992. The cubic root of 1988685946 is about 1257.5407533033.

The spelling of 1988685946 in words is "one billion, nine hundred eighty-eight million, six hundred eighty-five thousand, nine hundred forty-six".