39876421 has 24 divisors (see below), whose sum is σ = 47045880. Its totient is φ = 33554304.

The previous prime is 39876413. The next prime is 39876443. The reversal of 39876421 is 12467893.

It can be written as a sum of positive squares in 4 ways, for example, as 8673025 + 31203396 = 2945^2 + 5586^2 .

It is not a de Polignac number, because 39876421 - 2³ = 39876413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39876401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 135951 + ... + 136243.

It is an arithmetic number, because the mean of its divisors is an integer number (1960245).

Almost surely, 2^39876421 is an apocalyptic number.

It is an amenable number.

39876421 is a deficient number, since it is larger than the sum of its proper divisors (7169459).

39876421 is a wasteful number, since it uses less digits than its factorization.

39876421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373 (or 354 counting only the distinct ones).

The product of its digits is 72576, while the sum is 40.

The square root of 39876421 is about 6314.7779850126. Note that the first 3 decimals coincide. The cubic root of 39876421 is about 341.6426308163.

The spelling of 39876421 in words is "thirty-nine million, eight hundred seventy-six thousand, four hundred twenty-one".