2138401 has 2 divisors, whose sum is σ = 2138402. Its totient is φ = 2138400.

The previous prime is 2138399. The next prime is 2138407. The reversal of 2138401 is 1048312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1893376 + 245025 = 1376^2 + 495^2 .

It is a cyclic number.

It is not a de Polignac number, because 2138401 - 2¹ = 2138399 is a prime.

Together with 2138399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2138407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069200 + 1069201.

It is an arithmetic number, because the mean of its divisors is an integer number (1069201).

2^2138401 is an apocalyptic number.

It is an amenable number.

2138401 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138401 is an equidigital number, since it uses as much as digits as its factorization.

2138401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 2138401 is about 1462.3272547552. The cubic root of 2138401 is about 128.8337702237.

The spelling of 2138401 in words is "two million, one hundred thirty-eight thousand, four hundred one".