1540634138 has 8 divisors (see below), whose sum is σ = 2311492788. Its totient is φ = 770136544.

The previous prime is 1540634107. The next prime is 1540634149. The reversal of 1540634138 is 8314360451.

It can be written as a sum of positive squares in 2 ways, for example, as 1436940649 + 103693489 = 37907^2 + 10183^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1540634098 and 1540634107.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79331 + ... + 96822.

Almost surely, 2^1540634138 is an apocalyptic number.

1540634138 is a deficient number, since it is larger than the sum of its proper divisors (770858650).

1540634138 is a wasteful number, since it uses less digits than its factorization.

1540634138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180528.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 1540634138 is about 39250.9125753784. The cubic root of 1540634138 is about 1154.9588356362.

Adding to 1540634138 its reverse (8314360451), we get a palindrome (9854994589).

The spelling of 1540634138 in words is "one billion, five hundred forty million, six hundred thirty-four thousand, one hundred thirty-eight".