39961378 has 4 divisors (see below), whose sum is σ = 59942070. Its totient is φ = 19980688.

The previous prime is 39961343. The next prime is 39961379. The reversal of 39961378 is 87316993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87316993 = 23 ⋅3796391.

It can be written as a sum of positive squares in only one way, i.e., 36324729 + 3636649 = 6027^2 + 1907^2 .

It is not an unprimeable number, because it can be changed into a prime (39961379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9990343 + ... + 9990346.

Almost surely, 2^39961378 is an apocalyptic number.

39961378 is a deficient number, since it is larger than the sum of its proper divisors (19980692).

39961378 is a wasteful number, since it uses less digits than its factorization.

39961378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19980691.

The product of its digits is 244944, while the sum is 46.

The square root of 39961378 is about 6321.5012457485. The cubic root of 39961378 is about 341.8850827382.

The spelling of 39961378 in words is "thirty-nine million, nine hundred sixty-one thousand, three hundred seventy-eight".