1861057 has 8 divisors (see below), whose sum is σ = 2040192. Its totient is φ = 1683600.

The previous prime is 1861039. The next prime is 1861061. The reversal of 1861057 is 7501681.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1861057 - 2¹¹ = 1859009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1861157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3807 + ... + 4267.

It is an arithmetic number, because the mean of its divisors is an integer number (255024).

2^1861057 is an apocalyptic number.

It is an amenable number.

1861057 is a deficient number, since it is larger than the sum of its proper divisors (179135).

1861057 is a wasteful number, since it uses less digits than its factorization.

1861057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 1861057 is about 1364.2056296615. The cubic root of 1861057 is about 123.0041860783.

It can be divided in two parts, 18 and 61057, that added together give a triangular number (61075 = T₃₄₉).

The spelling of 1861057 in words is "one million, eight hundred sixty-one thousand, fifty-seven".