1939381 has 2 divisors, whose sum is σ = 1939382. Its totient is φ = 1939380.

The previous prime is 1939369. The next prime is 1939397. The reversal of 1939381 is 1839391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1232100 + 707281 = 1110^2 + 841^2 .

It is a cyclic number.

It is not a de Polignac number, because 1939381 - 2⁷ = 1939253 is a prime.

It is a super-2 number, since 2×1939381² = 7522397326322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1939331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969690 + 969691.

It is an arithmetic number, because the mean of its divisors is an integer number (969691).

2^1939381 is an apocalyptic number.

It is an amenable number.

1939381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1939381 is an equidigital number, since it uses as much as digits as its factorization.

1939381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 34.

The square root of 1939381 is about 1392.6166019404. The cubic root of 1939381 is about 124.7061042103.

The spelling of 1939381 in words is "one million, nine hundred thirty-nine thousand, three hundred eighty-one".