1555530040 has 32 divisors (see below), whose sum is σ = 3502485360. Its totient is φ = 621760000.

The previous prime is 1555530029. The next prime is 1555530047. The reversal of 1555530040 is 400355551.

It is a junction number, because it is equal to n+sod(n) for n = 1555529990 and 1555530008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555530047) 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, 44640 + ... + 71440.

Almost surely, 2^1555530040 is an apocalyptic number.

1555530040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1555530040 is an abundant number, since it is smaller than the sum of its proper divisors (1946955320).

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

1555530040 is a wasteful number, since it uses less digits than its factorization.

1555530040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28263 (or 28259 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 28.

The square root of 1555530040 is about 39440.2084172992. The cubic root of 1555530040 is about 1158.6692130643.

Adding to 1555530040 its reverse (400355551), we get a palindrome (1955885591).

The spelling of 1555530040 in words is "one billion, five hundred fifty-five million, five hundred thirty thousand, forty".