1557139 has 8 divisors (see below), whose sum is σ = 1611792. Its totient is φ = 1503360.

The previous prime is 1557137. The next prime is 1557151. The reversal of 1557139 is 9317551.

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

It is a cyclic number.

It is not a de Polignac number, because 1557139 - 2¹ = 1557137 is a prime.

1557139 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1557139.

It is not an unprimeable number, because it can be changed into a prime (1557131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6567 + ... + 6799.

It is an arithmetic number, because the mean of its divisors is an integer number (201474).

2^1557139 is an apocalyptic number.

1557139 is a deficient number, since it is larger than the sum of its proper divisors (54653).

1557139 is a wasteful number, since it uses less digits than its factorization.

1557139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437.

The product of its digits is 4725, while the sum is 31.

The square root of 1557139 is about 1247.8537574572. The cubic root of 1557139 is about 115.9068564620.

The spelling of 1557139 in words is "one million, five hundred fifty-seven thousand, one hundred thirty-nine".