1557023 has 4 divisors (see below), whose sum is σ = 1676808. Its totient is φ = 1437240.

The previous prime is 1557019. The next prime is 1557029. The reversal of 1557023 is 3207551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1557023 - 2² = 1557019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1557023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1557029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59873 + ... + 59898.

It is an arithmetic number, because the mean of its divisors is an integer number (419202).

2^1557023 is an apocalyptic number.

1557023 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1557023 is a deficient number, since it is larger than the sum of its proper divisors (119785).

1557023 is a wasteful number, since it uses less digits than its factorization.

1557023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119784.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 1557023 is about 1247.8072767860. The cubic root of 1557023 is about 115.9039782070.

The spelling of 1557023 in words is "one million, five hundred fifty-seven thousand, twenty-three".