2687397389 has 2 divisors, whose sum is σ = 2687397390. Its totient is φ = 2687397388.

The previous prime is 2687397379. The next prime is 2687397457. The reversal of 2687397389 is 9837937862.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1783372900 + 904024489 = 42230^2 + 30067^2 .

It is a cyclic number.

It is not a de Polignac number, because 2687397389 - 2²⁸ = 2418961933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2687397379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1343698694 + 1343698695.

It is an arithmetic number, because the mean of its divisors is an integer number (1343698695).

Almost surely, 2^2687397389 is an apocalyptic number.

It is an amenable number.

2687397389 is a deficient number, since it is larger than the sum of its proper divisors (1).

2687397389 is an equidigital number, since it uses as much as digits as its factorization.

2687397389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27433728, while the sum is 62.

The square root of 2687397389 is about 51840.1137055080. The cubic root of 2687397389 is about 1390.3067468214.

The spelling of 2687397389 in words is "two billion, six hundred eighty-seven million, three hundred ninety-seven thousand, three hundred eighty-nine".