1555425220 has 24 divisors (see below), whose sum is σ = 3267503064. Its totient is φ = 621958656.

The previous prime is 1555425211. The next prime is 1555425227. The reversal of 1555425220 is 225245551.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1028998084 + 526427136 = 32078^2 + 22944^2 .

It is not an unprimeable number, because it can be changed into a prime (1555425227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55932 + ... + 78988.

It is an arithmetic number, because the mean of its divisors is an integer number (136145961).

Almost surely, 2^1555425220 is an apocalyptic number.

1555425220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1555425220 is an abundant number, since it is smaller than the sum of its proper divisors (1712077844).

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

1555425220 is a wasteful number, since it uses less digits than its factorization.

1555425220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26439 (or 26437 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 31.

The square root of 1555425220 is about 39438.8795479790. The cubic root of 1555425220 is about 1158.6431866871.

The spelling of 1555425220 in words is "one billion, five hundred fifty-five million, four hundred twenty-five thousand, two hundred twenty".