1858261 has 2 divisors, whose sum is σ = 1858262. Its totient is φ = 1858260.

The previous prime is 1858249. The next prime is 1858267. The reversal of 1858261 is 1628581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1703025 + 155236 = 1305^2 + 394^2 .

It is a cyclic number.

It is not a de Polignac number, because 1858261 - 2⁷ = 1858133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1858267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 929130 + 929131.

It is an arithmetic number, because the mean of its divisors is an integer number (929131).

2^1858261 is an apocalyptic number.

It is an amenable number.

1858261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1858261 is an equidigital number, since it uses as much as digits as its factorization.

1858261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 31.

The square root of 1858261 is about 1363.1804722780. The cubic root of 1858261 is about 122.9425558542.

The spelling of 1858261 in words is "one million, eight hundred fifty-eight thousand, two hundred sixty-one".