1966139 has 8 divisors (see below), whose sum is σ = 2365440. Its totient is φ = 1596456.

The previous prime is 1966127. The next prime is 1966163. The reversal of 1966139 is 9316691.

1966139 = T₇₄₆ + T₇₄₇ + ... + T₇₅₂.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1966139 - 2⁴ = 1966123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1966099 and 1966108.

It is not an unprimeable number, because it can be changed into a prime (1966189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7259 + ... + 7524.

It is an arithmetic number, because the mean of its divisors is an integer number (295680).

2^1966139 is an apocalyptic number.

1966139 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1966139 is a deficient number, since it is larger than the sum of its proper divisors (399301).

1966139 is a wasteful number, since it uses less digits than its factorization.

1966139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14809.

The product of its digits is 8748, while the sum is 35.

The square root of 1966139 is about 1402.1907858776. The cubic root of 1966139 is about 125.2770176363.

It can be divided in two parts, 19 and 66139, that multiplied together give a square (1256641 = 1121²).

The spelling of 1966139 in words is "one million, nine hundred sixty-six thousand, one hundred thirty-nine".