1557069423 has 128 divisors (see below), whose sum is σ = 2844979200. Its totient is φ = 749629440.

The previous prime is 1557069419. The next prime is 1557069461. The reversal of 1557069423 is 3249607551.

It is not a de Polignac number, because 1557069423 - 2² = 1557069419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1557069473) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 9323686 + ... + 9323852.

It is an arithmetic number, because the mean of its divisors is an integer number (22226400).

Almost surely, 2^1557069423 is an apocalyptic number.

1557069423 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1557069423 is a deficient number, since it is larger than the sum of its proper divisors (1287909777).

1557069423 is a wasteful number, since it uses less digits than its factorization.

1557069423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262 (or 248 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 42.

The square root of 1557069423 is about 39459.7189929173. The cubic root of 1557069423 is about 1159.0513009686.

The spelling of 1557069423 in words is "one billion, five hundred fifty-seven million, sixty-nine thousand, four hundred twenty-three".