1557217434 has 8 divisors (see below), whose sum is σ = 3114434880. Its totient is φ = 519072476.

The previous prime is 1557217399. The next prime is 1557217439. The reversal of 1557217434 is 4347127551.

It is a sphenic number, since it is the product of 3 distinct primes.

1557217434 is an admirable number.

It is a super-2 number, since 2×1557217434² = 4849852273507088712, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1557217392 and 1557217401.

It is not an unprimeable number, because it can be changed into a prime (1557217439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129768114 + ... + 129768125.

It is an arithmetic number, because the mean of its divisors is an integer number (389304360).

Almost surely, 2^1557217434 is an apocalyptic number.

1557217434 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1557217434 is a wasteful number, since it uses less digits than its factorization.

1557217434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259536244.

The product of its digits is 117600, while the sum is 39.

The square root of 1557217434 is about 39461.5944178641. The cubic root of 1557217434 is about 1159.0880252799.

The spelling of 1557217434 in words is "one billion, five hundred fifty-seven million, two hundred seventeen thousand, four hundred thirty-four".