1557421542 has 24 divisors (see below), whose sum is σ = 3387553416. Its totient is φ = 517118976.

The previous prime is 1557421529. The next prime is 1557421543. The reversal of 1557421542 is 2451247551.

1557421542 is a `hidden beast` number, since 15 + 574 + 21 + 54 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1557421497 and 1557421506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1557421543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 163708 + ... + 172959.

It is an arithmetic number, because the mean of its divisors is an integer number (141148059).

Almost surely, 2^1557421542 is an apocalyptic number.

1557421542 is an abundant number, since it is smaller than the sum of its proper divisors (1830131874).

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

1557421542 is a wasteful number, since it uses less digits than its factorization.

1557421542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336932 (or 336929 counting only the distinct ones).

The product of its digits is 56000, while the sum is 36.

The square root of 1557421542 is about 39464.1804932017. The cubic root of 1557421542 is about 1159.1386644944.

The spelling of 1557421542 in words is "one billion, five hundred fifty-seven million, four hundred twenty-one thousand, five hundred forty-two".