1557223820 has 12 divisors (see below), whose sum is σ = 3270170064. Its totient is φ = 622889520.

The previous prime is 1557223807. The next prime is 1557223853. The reversal of 1557223820 is 283227551.

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, 38930576 + ... + 38930615.

It is an arithmetic number, because the mean of its divisors is an integer number (272514172).

Almost surely, 2^1557223820 is an apocalyptic number.

1557223820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1557223820 is an abundant number, since it is smaller than the sum of its proper divisors (1712946244).

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

1557223820 is a wasteful number, since it uses less digits than its factorization.

1557223820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77861200 (or 77861198 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 1557223820 is about 39461.6753318964. The cubic root of 1557223820 is about 1159.0896097142.

The spelling of 1557223820 in words is "one billion, five hundred fifty-seven million, two hundred twenty-three thousand, eight hundred twenty".