1557947 has 2 divisors, whose sum is σ = 1557948. Its totient is φ = 1557946.

The previous prime is 1557889. The next prime is 1557949. The reversal of 1557947 is 7497551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1557947 - 2⁶ = 1557883 is a prime.

Together with 1557949, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1557947.

It is not a weakly prime, because it can be changed into another prime (1557949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778973 + 778974.

It is an arithmetic number, because the mean of its divisors is an integer number (778974).

2^1557947 is an apocalyptic number.

1557947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1557947 is an equidigital number, since it uses as much as digits as its factorization.

1557947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44100, while the sum is 38.

The square root of 1557947 is about 1248.1774713557. The cubic root of 1557947 is about 115.9269010322.

The spelling of 1557947 in words is "one million, five hundred fifty-seven thousand, nine hundred forty-seven".