1555552240 has 80 divisors (see below), whose sum is σ = 3951398880. Its totient is φ = 564802560.

The previous prime is 1555552171. The next prime is 1555552253. The reversal of 1555552240 is 422555551.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 1555552196 and 1555552205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1087846 + ... + 1089274.

It is an arithmetic number, because the mean of its divisors is an integer number (49392486).

Almost surely, 2^1555552240 is an apocalyptic number.

1555552240 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 1555552240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1975699440).

1555552240 is an abundant number, since it is smaller than the sum of its proper divisors (2395846640).

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

1555552240 is a wasteful number, since it uses less digits than its factorization.

1555552240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2690 (or 2684 counting only the distinct ones).

The product of its (nonzero) digits is 50000, while the sum is 34.

The square root of 1555552240 is about 39440.4898549701. The cubic root of 1555552240 is about 1158.6747250835.

The spelling of 1555552240 in words is "one billion, five hundred fifty-five million, five hundred fifty-two thousand, two hundred forty".