1939631 has 2 divisors, whose sum is σ = 1939632. Its totient is φ = 1939630.

The previous prime is 1939621. The next prime is 1939633. The reversal of 1939631 is 1369391.

It is a strong prime.

It is an emirp because it is prime and its reverse (1369391) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1939631 is a prime.

It is a super-2 number, since 2×1939631² = 7524336832322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1939633, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1939633) 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 as a sum of consecutive naturals, namely, 969815 + 969816.

It is an arithmetic number, because the mean of its divisors is an integer number (969816).

2^1939631 is an apocalyptic number.

1939631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1939631 is an equidigital number, since it uses as much as digits as its factorization.

1939631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4374, while the sum is 32.

The square root of 1939631 is about 1392.7063581387. The cubic root of 1939631 is about 124.7114624813.

The spelling of 1939631 in words is "one million, nine hundred thirty-nine thousand, six hundred thirty-one".