1555605140 has 12 divisors (see below), whose sum is σ = 3266770836. Its totient is φ = 622242048.

The previous prime is 1555605133. The next prime is 1555605157. The reversal of 1555605140 is 415065551.

It can be written as a sum of positive squares in 2 ways, for example, as 584285584 + 971319556 = 24172^2 + 31166^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1555605097 and 1555605106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38890109 + ... + 38890148.

It is an arithmetic number, because the mean of its divisors is an integer number (272230903).

Almost surely, 2^1555605140 is an apocalyptic number.

1555605140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1555605140 is an abundant number, since it is smaller than the sum of its proper divisors (1711165696).

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

1555605140 is a wasteful number, since it uses less digits than its factorization.

1555605140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77780266 (or 77780264 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 32.

The square root of 1555605140 is about 39441.1604798845. The cubic root of 1555605140 is about 1158.6878593683.

The spelling of 1555605140 in words is "one billion, five hundred fifty-five million, six hundred five thousand, one hundred forty".