1356123556 has 24 divisors (see below), whose sum is σ = 2565644480. Its totient is φ = 625011552.

The previous prime is 1356123553. The next prime is 1356123557. The reversal of 1356123556 is 6553216531.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (1356123553) 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, 238320 + ... + 243943.

Almost surely, 2^1356123556 is an apocalyptic number.

It is an amenable number.

1356123556 is a deficient number, since it is larger than the sum of its proper divisors (1209520924).

1356123556 is a wasteful number, since it uses less digits than its factorization.

1356123556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482323 (or 482321 counting only the distinct ones).

The product of its digits is 81000, while the sum is 37.

The square root of 1356123556 is about 36825.5829010214. The cubic root of 1356123556 is about 1106.8779939889.

The spelling of 1356123556 in words is "one billion, three hundred fifty-six million, one hundred twenty-three thousand, five hundred fifty-six".