1937989 has 2 divisors, whose sum is σ = 1937990. Its totient is φ = 1937988.

The previous prime is 1937987. The next prime is 1937993. The reversal of 1937989 is 9897391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1050625 + 887364 = 1025^2 + 942^2 .

It is a cyclic number.

It is not a de Polignac number, because 1937989 - 2¹ = 1937987 is a prime.

Together with 1937987, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1937987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 968994 + 968995.

It is an arithmetic number, because the mean of its divisors is an integer number (968995).

2^1937989 is an apocalyptic number.

It is an amenable number.

1937989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1937989 is an equidigital number, since it uses as much as digits as its factorization.

1937989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 46.

The square root of 1937989 is about 1392.1167336111. The cubic root of 1937989 is about 124.6762609346.

It can be divided in two parts, 1937 and 989, that added together give a triangular number (2926 = T₇₆).

The spelling of 1937989 in words is "one million, nine hundred thirty-seven thousand, nine hundred eighty-nine".