1555423530 has 64 divisors (see below), whose sum is σ = 3929990400. Its totient is φ = 393214976.

The previous prime is 1555423523. The next prime is 1555423531. The reversal of 1555423530 is 353245551.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1555423491 and 1555423500.

It is not an unprimeable number, because it can be changed into a prime (1555423531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67996 + ... + 87944.

It is an arithmetic number, because the mean of its divisors is an integer number (61406100).

Almost surely, 2^1555423530 is an apocalyptic number.

1555423530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1555423530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1964995200).

1555423530 is an abundant number, since it is smaller than the sum of its proper divisors (2374566870).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1555423530 is a wasteful number, since it uses less digits than its factorization.

1555423530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20095.

The product of its (nonzero) digits is 45000, while the sum is 33.

The square root of 1555423530 is about 39438.8581224153. The cubic root of 1555423530 is about 1158.6427670574.

The spelling of 1555423530 in words is "one billion, five hundred fifty-five million, four hundred twenty-three thousand, five hundred thirty".