1901861 has 4 divisors (see below), whose sum is σ = 2048172. Its totient is φ = 1755552.

The previous prime is 1901857. The next prime is 1901891. The reversal of 1901861 is 1681091.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 185761 + 1716100 = 431^2 + 1310^2 .

It is a cyclic number.

It is not a de Polignac number, because 1901861 - 2² = 1901857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1901861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1901831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73136 + ... + 73161.

It is an arithmetic number, because the mean of its divisors is an integer number (512043).

2^1901861 is an apocalyptic number.

It is an amenable number.

1901861 is a deficient number, since it is larger than the sum of its proper divisors (146311).

1901861 is a wasteful number, since it uses less digits than its factorization.

1901861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146310.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 1901861 is about 1379.0797656408. The cubic root of 1901861 is about 123.8966577412.

The spelling of 1901861 in words is "one million, nine hundred one thousand, eight hundred sixty-one".