39857961 has 32 divisors (see below), whose sum is σ = 63649152. Its totient is φ = 21864960.

The previous prime is 39857959. The next prime is 39857963. The reversal of 39857961 is 16975893.

It is an interprime number because it is at equal distance from previous prime (39857959) and next prime (39857963).

It is not a de Polignac number, because 39857961 - 2¹ = 39857959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39857961.

It is not an unprimeable number, because it can be changed into a prime (39857963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21861 + ... + 23613.

It is an arithmetic number, because the mean of its divisors is an integer number (1989036).

Almost surely, 2^39857961 is an apocalyptic number.

It is an amenable number.

39857961 is a deficient number, since it is larger than the sum of its proper divisors (23791191).

39857961 is a wasteful number, since it uses less digits than its factorization.

39857961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1833.

The product of its digits is 408240, while the sum is 48.

The square root of 39857961 is about 6313.3161650594. The cubic root of 39857961 is about 341.5899037807.

The spelling of 39857961 in words is "thirty-nine million, eight hundred fifty-seven thousand, nine hundred sixty-one".