1555005540 has 48 divisors (see below), whose sum is σ = 4749837120. Its totient is φ = 376970880.

The previous prime is 1555005533. The next prime is 1555005541. The reversal of 1555005540 is 455005551.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1555005498 and 1555005507.

It is not an unprimeable number, because it can be changed into a prime (1555005541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1177375 + ... + 1178694.

It is an arithmetic number, because the mean of its divisors is an integer number (98954940).

Almost surely, 2^1555005540 is an apocalyptic number.

1555005540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1555005540 is an abundant number, since it is smaller than the sum of its proper divisors (3194831580).

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

1555005540 is a wasteful number, since it uses less digits than its factorization.

1555005540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2356092 (or 2356090 counting only the distinct ones).

The product of its (nonzero) digits is 12500, while the sum is 30.

The square root of 1555005540 is about 39433.5585510616. The cubic root of 1555005540 is about 1158.5389701452.

The spelling of 1555005540 in words is "one billion, five hundred fifty-five million, five thousand, five hundred forty".