2145989973 has 16 divisors (see below), whose sum is σ = 3033453056. Its totient is φ = 1347088320.

The previous prime is 2145989971. The next prime is 2145989977. The reversal of 2145989973 is 3799895412.

It is not a de Polignac number, because 2145989973 - 2¹ = 2145989971 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145989971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 308386 + ... + 315267.

It is an arithmetic number, because the mean of its divisors is an integer number (189590816).

Almost surely, 2^2145989973 is an apocalyptic number.

It is an amenable number.

2145989973 is a deficient number, since it is larger than the sum of its proper divisors (887463083).

2145989973 is a wasteful number, since it uses less digits than its factorization.

2145989973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623724.

The product of its digits is 4898880, while the sum is 57.

The square root of 2145989973 is about 46324.8310628328. The cubic root of 2145989973 is about 1289.8599637665.

The spelling of 2145989973 in words is "two billion, one hundred forty-five million, nine hundred eighty-nine thousand, nine hundred seventy-three".