1938641 has 6 divisors (see below), whose sum is σ = 1974726. Its totient is φ = 1903200.

The previous prime is 1938637. The next prime is 1938659. The reversal of 1938641 is 1468391.

1938641 = T₂₂₁ + T₂₂₂ + ... + T₂₈₁.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 193600 + 1745041 = 440^2 + 1321^2 .

It is not a de Polignac number, because 1938641 - 2² = 1938637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1938598 and 1938607.

It is not an unprimeable number, because it can be changed into a prime (1938611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3461 + ... + 3981.

It is an arithmetic number, because the mean of its divisors is an integer number (329121).

2^1938641 is an apocalyptic number.

It is an amenable number.

1938641 is a deficient number, since it is larger than the sum of its proper divisors (36085).

1938641 is an frugal number, since it uses more digits than its factorization.

1938641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643 (or 582 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 1938641 is about 1392.3508896826. The cubic root of 1938641 is about 124.6902410291.

The spelling of 1938641 in words is "one million, nine hundred thirty-eight thousand, six hundred forty-one".