1540229 has 2 divisors, whose sum is σ = 1540230. Its totient is φ = 1540228.

The previous prime is 1540223. The next prime is 1540243. The reversal of 1540229 is 9220451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1288225 + 252004 = 1135^2 + 502^2 .

It is an emirp because it is prime and its reverse (9220451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1540229 - 2⁸ = 1539973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1540223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770114 + 770115.

It is an arithmetic number, because the mean of its divisors is an integer number (770115).

2^1540229 is an apocalyptic number.

It is an amenable number.

1540229 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540229 is an equidigital number, since it uses as much as digits as its factorization.

1540229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1540229 is about 1241.0596278987. The cubic root of 1540229 is about 115.4857587558.

The spelling of 1540229 in words is "one million, five hundred forty thousand, two hundred twenty-nine".