1864921 has 2 divisors, whose sum is σ = 1864922. Its totient is φ = 1864920.

The previous prime is 1864901. The next prime is 1864939. The reversal of 1864921 is 1294681.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1123600 + 741321 = 1060^2 + 861^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1864921 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1864901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932460 + 932461.

It is an arithmetic number, because the mean of its divisors is an integer number (932461).

2^1864921 is an apocalyptic number.

It is an amenable number.

1864921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1864921 is an equidigital number, since it uses as much as digits as its factorization.

1864921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 31.

The square root of 1864921 is about 1365.6211041134. The cubic root of 1864921 is about 123.0892559456.

The spelling of 1864921 in words is "one million, eight hundred sixty-four thousand, nine hundred twenty-one".