1861263 has 6 divisors (see below), whose sum is σ = 2688504. Its totient is φ = 1240836.

The previous prime is 1861261. The next prime is 1861267. The reversal of 1861263 is 3621681.

It is not a de Polignac number, because 1861263 - 2¹ = 1861261 is a prime.

1861263 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861261) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 103395 + ... + 103412.

It is an arithmetic number, because the mean of its divisors is an integer number (448084).

2^1861263 is an apocalyptic number.

1861263 is a deficient number, since it is larger than the sum of its proper divisors (827241).

1861263 is a wasteful number, since it uses less digits than its factorization.

1861263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206813 (or 206810 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 1861263 is about 1364.2811293865. The cubic root of 1861263 is about 123.0087243465.

The spelling of 1861263 in words is "one million, eight hundred sixty-one thousand, two hundred sixty-three".