139844966 has 4 divisors (see below), whose sum is σ = 209767452. Its totient is φ = 69922482.

The previous prime is 139844963. The next prime is 139844977. The reversal of 139844966 is 669448931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 669448931 = 173 ⋅3869647.

It is a super-2 number, since 2×139844966² = 39113229031082312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139844963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34961240 + ... + 34961243.

It is an arithmetic number, because the mean of its divisors is an integer number (52441863).

Almost surely, 2^139844966 is an apocalyptic number.

139844966 is a deficient number, since it is larger than the sum of its proper divisors (69922486).

139844966 is an equidigital number, since it uses as much as digits as its factorization.

139844966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69922485.

The product of its digits is 1119744, while the sum is 50.

The square root of 139844966 is about 11825.6063692311. The cubic root of 139844966 is about 519.0576695978.

It can be divided in two parts, 1398 and 44966, that added together give a palindrome (46364).

The spelling of 139844966 in words is "one hundred thirty-nine million, eight hundred forty-four thousand, nine hundred sixty-six".