1939969 has 2 divisors, whose sum is σ = 1939970. Its totient is φ = 1939968.

The previous prime is 1939967. The next prime is 1939999. The reversal of 1939969 is 9699391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1129969 + 810000 = 1063^2 + 900^2 .

It is a cyclic number.

It is not a de Polignac number, because 1939969 - 2¹ = 1939967 is a prime.

It is a super-2 number, since 2×1939969² = 7526959441922, which contains 22 as substring.

Together with 1939967, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1939961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969984 + 969985.

It is an arithmetic number, because the mean of its divisors is an integer number (969985).

2^1939969 is an apocalyptic number.

It is an amenable number.

1939969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1939969 is an equidigital number, since it uses as much as digits as its factorization.

1939969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 118098, while the sum is 46.

The square root of 1939969 is about 1392.8276993225. The cubic root of 1939969 is about 124.7187061316.

It can be divided in two parts, 1939 and 969, that multiplied together give a triangular number (1878891 = T₁₉₃₈).

The spelling of 1939969 in words is "one million, nine hundred thirty-nine thousand, nine hundred sixty-nine".