1556140223 has 24 divisors (see below), whose sum is σ = 1814588160. Its totient is φ = 1329728400.

The previous prime is 1556140219. The next prime is 1556140277. The reversal of 1556140223 is 3220416551.

It is not a de Polignac number, because 1556140223 - 2² = 1556140219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1556140123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 298586 + ... + 303752.

It is an arithmetic number, because the mean of its divisors is an integer number (75607840).

Almost surely, 2^1556140223 is an apocalyptic number.

1556140223 is a deficient number, since it is larger than the sum of its proper divisors (258447937).

1556140223 is a wasteful number, since it uses less digits than its factorization.

1556140223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5339 (or 5328 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 1556140223 is about 39447.9432036703. The cubic root of 1556140223 is about 1158.8206957989.

Adding to 1556140223 its reverse (3220416551), we get a palindrome (4776556774).

The spelling of 1556140223 in words is "one billion, five hundred fifty-six million, one hundred forty thousand, two hundred twenty-three".