1555423240 has 32 divisors (see below), whose sum is σ = 3999660480. Its totient is φ = 533287872.

The previous prime is 1555423213. The next prime is 1555423241. The reversal of 1555423240 is 423245551.

It is not an unprimeable number, because it can be changed into a prime (1555423241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2777262 + ... + 2777821.

It is an arithmetic number, because the mean of its divisors is an integer number (124989390).

Almost surely, 2^1555423240 is an apocalyptic number.

1555423240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1555423240 is an abundant number, since it is smaller than the sum of its proper divisors (2444237240).

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

1555423240 is a wasteful number, since it uses less digits than its factorization.

1555423240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5555101 (or 5555097 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 1555423240 is about 39438.8544458381. The cubic root of 1555423240 is about 1158.6426950499.

Adding to 1555423240 its reverse (423245551), we get a palindrome (1978668791).

The spelling of 1555423240 in words is "one billion, five hundred fifty-five million, four hundred twenty-three thousand, two hundred forty".