1988901745 has 16 divisors (see below), whose sum is σ = 2411133120. Its totient is φ = 1574852544.

The previous prime is 1988901743. The next prime is 1988901749. The reversal of 1988901745 is 5471098891.

It is a cyclic number.

It is not a de Polignac number, because 1988901745 - 2¹ = 1988901743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1988901692 and 1988901701.

It is not an unprimeable number, because it can be changed into a prime (1988901743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 885594 + ... + 887836.

It is an arithmetic number, because the mean of its divisors is an integer number (150695820).

Almost surely, 2^1988901745 is an apocalyptic number.

It is an amenable number.

1988901745 is a deficient number, since it is larger than the sum of its proper divisors (422231375).

1988901745 is a wasteful number, since it uses less digits than its factorization.

1988901745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3984.

The product of its (nonzero) digits is 725760, while the sum is 52.

The square root of 1988901745 is about 44597.1046705949. The cubic root of 1988901745 is about 1257.5862383168.

The spelling of 1988901745 in words is "one billion, nine hundred eighty-eight million, nine hundred one thousand, seven hundred forty-five".