1540861 has 4 divisors (see below), whose sum is σ = 1760992. Its totient is φ = 1320732.

The previous prime is 1540859. The next prime is 1540867. The reversal of 1540861 is 1680451.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1680451 = 193 ⋅8707.

It is not a de Polignac number, because 1540861 - 2¹ = 1540859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110055 + ... + 110068.

It is an arithmetic number, because the mean of its divisors is an integer number (440248).

2^1540861 is an apocalyptic number.

It is an amenable number.

1540861 is a deficient number, since it is larger than the sum of its proper divisors (220131).

1540861 is an equidigital number, since it uses as much as digits as its factorization.

1540861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220130.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 1540861 is about 1241.3142229105. The cubic root of 1540861 is about 115.5015522989.

It can be divided in two parts, 1540 and 861, that added together give a 4-th power (2401 = 7⁴).

The spelling of 1540861 in words is "one million, five hundred forty thousand, eight hundred sixty-one".