1800157 has 2 divisors, whose sum is σ = 1800158. Its totient is φ = 1800156.

The previous prime is 1800137. The next prime is 1800167. The reversal of 1800157 is 7510081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1104601 + 695556 = 1051^2 + 834^2 .

It is an emirp because it is prime and its reverse (7510081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1800157 - 2¹¹ = 1798109 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1800137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900078 + 900079.

It is an arithmetic number, because the mean of its divisors is an integer number (900079).

2^1800157 is an apocalyptic number.

It is an amenable number.

1800157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1800157 is an equidigital number, since it uses as much as digits as its factorization.

1800157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 22.

The square root of 1800157 is about 1341.6992956695. The cubic root of 1800157 is about 121.6475764965.

The spelling of 1800157 in words is "one million, eight hundred thousand, one hundred fifty-seven".