1555420120 has 16 divisors (see below), whose sum is σ = 3499695360. Its totient is φ = 622168032.

The previous prime is 1555420109. The next prime is 1555420193. The reversal of 1555420120 is 210245551.

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, 19442712 + ... + 19442791.

It is an arithmetic number, because the mean of its divisors is an integer number (218730960).

Almost surely, 2^1555420120 is an apocalyptic number.

1555420120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1555420120 is an abundant number, since it is smaller than the sum of its proper divisors (1944275240).

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

1555420120 is a wasteful number, since it uses less digits than its factorization.

1555420120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38885514 (or 38885510 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 1555420120 is about 39438.8148909168. The cubic root of 1555420120 is about 1158.6419203481.

Adding to 1555420120 its reverse (210245551), we get a palindrome (1765665671).

The spelling of 1555420120 in words is "one billion, five hundred fifty-five million, four hundred twenty thousand, one hundred twenty".