1949557 has 2 divisors, whose sum is σ = 1949558. Its totient is φ = 1949556.

The previous prime is 1949539. The next prime is 1949573. The reversal of 1949557 is 7559491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1920996 + 28561 = 1386^2 + 169^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1949557 is a prime.

1949557 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1949527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 974778 + 974779.

It is an arithmetic number, because the mean of its divisors is an integer number (974779).

2^1949557 is an apocalyptic number.

It is an amenable number.

1949557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1949557 is an equidigital number, since it uses as much as digits as its factorization.

1949557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56700, while the sum is 40.

The square root of 1949557 is about 1396.2653759225. The cubic root of 1949557 is about 124.9238362688.

The spelling of 1949557 in words is "one million, nine hundred forty-nine thousand, five hundred fifty-seven".