1555420000 has 120 divisors (see below), whose sum is σ = 3876802776. Its totient is φ = 614016000.

The previous prime is 1555419893. The next prime is 1555420007. The reversal of 1555420000 is 245551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555420007) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1659532 + ... + 1660468.

Almost surely, 2^1555420000 is an apocalyptic number.

1555420000 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 1555420000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1938401388).

1555420000 is an abundant number, since it is smaller than the sum of its proper divisors (2321382776).

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

1555420000 is an frugal number, since it uses more digits than its factorization.

1555420000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050 (or 1027 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 1555420000 is about 39438.8133695729. The cubic root of 1555420000 is about 1158.6418905519.

Adding to 1555420000 its reverse (245551), we get a palindrome (1555665551).

The spelling of 1555420000 in words is "one billion, five hundred fifty-five million, four hundred twenty thousand".