1555023040 has 56 divisors (see below), whose sum is σ = 3713268672. Its totient is φ = 620267520.

The previous prime is 1555023037. The next prime is 1555023049. The reversal of 1555023040 is 403205551.

It is a junction number, because it is equal to n+sod(n) for n = 1555022996 and 1555023014.

It is not an unprimeable number, because it can be changed into a prime (1555023049) 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, 110820 + ... + 124060.

Almost surely, 2^1555023040 is an apocalyptic number.

1555023040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1555023040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1856634336).

1555023040 is an abundant number, since it is smaller than the sum of its proper divisors (2158245632).

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

1555023040 is a wasteful number, since it uses less digits than its factorization.

1555023040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13625 (or 13615 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 1555023040 is about 39433.7804426611. The cubic root of 1555023040 is about 1158.5433161867.

Adding to 1555023040 its reverse (403205551), we get a palindrome (1958228591).

The spelling of 1555023040 in words is "one billion, five hundred fifty-five million, twenty-three thousand, forty".