1920861 has 8 divisors (see below), whose sum is σ = 2845760. Its totient is φ = 1280556.

The previous prime is 1920859. The next prime is 1920883. The reversal of 1920861 is 1680291.

It is not a de Polignac number, because 1920861 - 2¹ = 1920859 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 71143 = 1920861 / (1 + 9 + 2 + 0 + 8 + 6 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1920811) 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, 35545 + ... + 35598.

It is an arithmetic number, because the mean of its divisors is an integer number (355720).

2^1920861 is an apocalyptic number.

It is an amenable number.

1920861 is a deficient number, since it is larger than the sum of its proper divisors (924899).

1920861 is an equidigital number, since it uses as much as digits as its factorization.

1920861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71152 (or 71146 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 1920861 is about 1385.9512978456. The cubic root of 1920861 is about 124.3078761227.

The spelling of 1920861 in words is "one million, nine hundred twenty thousand, eight hundred sixty-one".