1557420436 has 72 divisors (see below), whose sum is σ = 3347888544. Its totient is φ = 624930240.

The previous prime is 1557420409. The next prime is 1557420451. The reversal of 1557420436 is 6340247551.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1557420395 and 1557420404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 300015 + ... + 305161.

It is an arithmetic number, because the mean of its divisors is an integer number (46498452).

Almost surely, 2^1557420436 is an apocalyptic number.

It is an amenable number.

1557420436 is an abundant number, since it is smaller than the sum of its proper divisors (1790468108).

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

1557420436 is a wasteful number, since it uses less digits than its factorization.

1557420436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5221 (or 5196 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 37.

The square root of 1557420436 is about 39464.1664804921. The cubic root of 1557420436 is about 1159.1383901076.

Adding to 1557420436 its reverse (6340247551), we get a palindrome (7897667987).

The spelling of 1557420436 in words is "one billion, five hundred fifty-seven million, four hundred twenty thousand, four hundred thirty-six".