1540223207 has 2 divisors, whose sum is σ = 1540223208. Its totient is φ = 1540223206.

The previous prime is 1540223173. The next prime is 1540223257. The reversal of 1540223207 is 7023220451.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1540223207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1540223257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770111603 + 770111604.

It is an arithmetic number, because the mean of its divisors is an integer number (770111604).

Almost surely, 2^1540223207 is an apocalyptic number.

1540223207 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540223207 is an equidigital number, since it uses as much as digits as its factorization.

1540223207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 1540223207 is about 39245.6775581719. The cubic root of 1540223207 is about 1154.8561397006.

Adding to 1540223207 its reverse (7023220451), we get a palindrome (8563443658).

The spelling of 1540223207 in words is "one billion, five hundred forty million, two hundred twenty-three thousand, two hundred seven".