39978119 has 4 divisors (see below), whose sum is σ = 40633560. Its totient is φ = 39322680.

The previous prime is 39978097. The next prime is 39978121. The reversal of 39978119 is 91187993.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39978119 is a prime.

It is a super-2 number, since 2×39978119² = 3196499997556322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39978139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327629 + ... + 327750.

It is an arithmetic number, because the mean of its divisors is an integer number (10158390).

Almost surely, 2^39978119 is an apocalyptic number.

39978119 is a deficient number, since it is larger than the sum of its proper divisors (655441).

39978119 is an equidigital number, since it uses as much as digits as its factorization.

39978119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655440.

The product of its digits is 122472, while the sum is 47.

The square root of 39978119 is about 6322.8252387679. The cubic root of 39978119 is about 341.9328179882.

The spelling of 39978119 in words is "thirty-nine million, nine hundred seventy-eight thousand, one hundred nineteen".