1555123823 has 6 divisors (see below), whose sum is σ = 1709351112. Its totient is φ = 1413748820.

The previous prime is 1555123781. The next prime is 1555123847. The reversal of 1555123823 is 3283215551.

It is a happy number.

It is not a de Polignac number, because 1555123823 - 2¹⁰ = 1555122799 is a prime.

It is a super-3 number, since 3×1555123823³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555123883) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6426011 + ... + 6426252.

It is an arithmetic number, because the mean of its divisors is an integer number (284891852).

Almost surely, 2^1555123823 is an apocalyptic number.

1555123823 is a deficient number, since it is larger than the sum of its proper divisors (154227289).

1555123823 is a wasteful number, since it uses less digits than its factorization.

1555123823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12852285 (or 12852274 counting only the distinct ones).

The product of its digits is 36000, while the sum is 35.

The square root of 1555123823 is about 39435.0582984227. The cubic root of 1555123823 is about 1158.5683445294.

The spelling of 1555123823 in words is "one billion, five hundred fifty-five million, one hundred twenty-three thousand, eight hundred twenty-three".