1540138 has 4 divisors (see below), whose sum is σ = 2310210. Its totient is φ = 770068.

The previous prime is 1540109. The next prime is 1540141. The reversal of 1540138 is 8310451.

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., 1481089 + 59049 = 1217^2 + 243^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385033 + ... + 385036.

2^1540138 is an apocalyptic number.

1540138 is a deficient number, since it is larger than the sum of its proper divisors (770072).

1540138 is an equidigital number, since it uses as much as digits as its factorization.

1540138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770071.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 1540138 is about 1241.0229651380. The cubic root of 1540138 is about 115.4834843298.

Adding to 1540138 its reverse (8310451), we get a palindrome (9850589).

The spelling of 1540138 in words is "one million, five hundred forty thousand, one hundred thirty-eight".