2138400034 has 4 divisors (see below), whose sum is σ = 3207600054. Its totient is φ = 1069200016.

The previous prime is 2138399993. The next prime is 2138400053. The reversal of 2138400034 is 4300048312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1685348809 + 453051225 = 41053^2 + 21285^2 .

It is a super-2 number, since 2×2138400034² = 9145509410822402312, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2138399981 and 2138400008.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 534600007 + ... + 534600010.

Almost surely, 2^2138400034 is an apocalyptic number.

2138400034 is a deficient number, since it is larger than the sum of its proper divisors (1069200020).

2138400034 is a wasteful number, since it uses less digits than its factorization.

2138400034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069200019.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 2138400034 is about 46242.8376508190. The cubic root of 2138400034 is about 1288.3375082394.

Adding to 2138400034 its reverse (4300048312), we get a palindrome (6438448346).

The spelling of 2138400034 in words is "two billion, one hundred thirty-eight million, four hundred thousand, thirty-four".