1550040000 has 140 divisors (see below), whose sum is σ = 5125190664. Its totient is φ = 413312000.

The previous prime is 1550039987. The next prime is 1550040043. The reversal of 1550040000 is 400551.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 113542 + ... + 126458.

Almost surely, 2^1550040000 is an apocalyptic number.

1550040000 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 1550040000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2562595332).

1550040000 is an abundant number, since it is smaller than the sum of its proper divisors (3575150664).

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

1550040000 is an equidigital number, since it uses as much as digits as its factorization.

1550040000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12952 (or 12927 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 1550040000 is about 39370.5473672897. The cubic root of 1550040000 is about 1157.3044823990.

Adding to 1550040000 its reverse (400551), we get a palindrome (1550440551).

The spelling of 1550040000 in words is "one billion, five hundred fifty million, forty thousand".