2173969387 has 2 divisors, whose sum is σ = 2173969388. Its totient is φ = 2173969386.

The previous prime is 2173969307. The next prime is 2173969403. The reversal of 2173969387 is 7839693712.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2173969387 - 2¹⁵ = 2173936619 is a prime.

It is a super-2 number, since 2×2173969387² = 9452285791226311538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2173969307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086984693 + 1086984694.

It is an arithmetic number, because the mean of its divisors is an integer number (1086984694).

Almost surely, 2^2173969387 is an apocalyptic number.

2173969387 is a deficient number, since it is larger than the sum of its proper divisors (1).

2173969387 is an equidigital number, since it uses as much as digits as its factorization.

2173969387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3429216, while the sum is 55.

The square root of 2173969387 is about 46625.8446250575. The cubic root of 2173969387 is about 1295.4415069577.

The spelling of 2173969387 in words is "two billion, one hundred seventy-three million, nine hundred sixty-nine thousand, three hundred eighty-seven".