1540145 has 8 divisors (see below), whose sum is σ = 1869480. Its totient is φ = 1217920.

The previous prime is 1540141. The next prime is 1540151. The reversal of 1540145 is 5410451.

It can be written as a sum of positive squares in 4 ways, for example, as 64 + 1540081 = 8^2 + 1241^2 .

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

It is not a de Polignac number, because 1540145 - 2² = 1540141 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1540141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1286 + ... + 2175.

It is an arithmetic number, because the mean of its divisors is an integer number (233685).

2^1540145 is an apocalyptic number.

It is an amenable number.

1540145 is a deficient number, since it is larger than the sum of its proper divisors (329335).

1540145 is an equidigital number, since it uses as much as digits as its factorization.

1540145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3555.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1540145 is about 1241.0257853888. The cubic root of 1540145 is about 115.4836592888.

Adding to 1540145 its reverse (5410451), we get a palindrome (6950596).

The spelling of 1540145 in words is "one million, five hundred forty thousand, one hundred forty-five".