39978434 has 4 divisors (see below), whose sum is σ = 59967654. Its totient is φ = 19989216.

The previous prime is 39978409. The next prime is 39978473. The reversal of 39978434 is 43487993.

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

It can be written as a sum of positive squares in only one way, i.e., 35343025 + 4635409 = 5945^2 + 2153^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9994607 + ... + 9994610.

Almost surely, 2^39978434 is an apocalyptic number.

39978434 is a deficient number, since it is larger than the sum of its proper divisors (19989220).

39978434 is a wasteful number, since it uses less digits than its factorization.

39978434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19989219.

The product of its digits is 653184, while the sum is 47.

The square root of 39978434 is about 6322.8501484694. The cubic root of 39978434 is about 341.9337160508.

The spelling of 39978434 in words is "thirty-nine million, nine hundred seventy-eight thousand, four hundred thirty-four".