39878478 has 12 divisors (see below), whose sum is σ = 86403408. Its totient is φ = 13292820.

The previous prime is 39878477. The next prime is 39878479. The reversal of 39878478 is 87487893.

It is an interprime number because it is at equal distance from previous prime (39878477) and next prime (39878479).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39878477) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1107718 + ... + 1107753.

It is an arithmetic number, because the mean of its divisors is an integer number (7200284).

Almost surely, 2^39878478 is an apocalyptic number.

39878478 is an abundant number, since it is smaller than the sum of its proper divisors (46524930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39878478 is a wasteful number, since it uses less digits than its factorization.

39878478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2215479 (or 2215476 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The square root of 39878478 is about 6314.9408548299. The cubic root of 39878478 is about 341.6485051884.

The spelling of 39878478 in words is "thirty-nine million, eight hundred seventy-eight thousand, four hundred seventy-eight".