1988745 has 32 divisors (see below), whose sum is σ = 3680640. Its totient is φ = 906240.

The previous prime is 1988729. The next prime is 1988759. The reversal of 1988745 is 5478891.

1988745 is nontrivially palindromic in base 14.

It is not a de Polignac number, because 1988745 - 2⁴ = 1988729 is a prime.

1988745 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1988697 and 1988706.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2451 + ... + 3159.

It is an arithmetic number, because the mean of its divisors is an integer number (115020).

2^1988745 is an apocalyptic number.

1988745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1988745 is a deficient number, since it is larger than the sum of its proper divisors (1691895).

1988745 is a wasteful number, since it uses less digits than its factorization.

1988745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745.

The product of its digits is 80640, while the sum is 42.

The square root of 1988745 is about 1410.2287048561. The cubic root of 1988745 is about 125.7553200731.

The spelling of 1988745 in words is "one million, nine hundred eighty-eight thousand, seven hundred forty-five".