39378641 has 4 divisors (see below), whose sum is σ = 39525300. Its totient is φ = 39231984.

The previous prime is 39378617. The next prime is 39378643. The reversal of 39378641 is 14687393.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10916416 + 28462225 = 3304^2 + 5335^2 .

It is a cyclic number.

It is not a de Polignac number, because 39378641 - 2¹⁰ = 39377617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39378643) 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, 72926 + ... + 73463.

It is an arithmetic number, because the mean of its divisors is an integer number (9881325).

Almost surely, 2^39378641 is an apocalyptic number.

It is an amenable number.

39378641 is a deficient number, since it is larger than the sum of its proper divisors (146659).

39378641 is a wasteful number, since it uses less digits than its factorization.

39378641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146658.

The product of its digits is 108864, while the sum is 41.

The square root of 39378641 is about 6275.2403141234. The cubic root of 39378641 is about 340.2150916964.

The spelling of 39378641 in words is "thirty-nine million, three hundred seventy-eight thousand, six hundred forty-one".