39471981 has 16 divisors (see below), whose sum is σ = 53403648. Its totient is φ = 25930800.

The previous prime is 39471967. The next prime is 39471983. The reversal of 39471981 is 18917493.

It is a happy number.

It is not a de Polignac number, because 39471981 - 2¹¹ = 39469933 is a prime.

It is a super-2 number, since 2×39471981² = 3116074568128722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39471983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80146 + ... + 80636.

It is an arithmetic number, because the mean of its divisors is an integer number (3337728).

Almost surely, 2^39471981 is an apocalyptic number.

It is an amenable number.

39471981 is a deficient number, since it is larger than the sum of its proper divisors (13931667).

39471981 is a wasteful number, since it uses less digits than its factorization.

39471981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832.

The product of its digits is 54432, while the sum is 42.

The square root of 39471981 is about 6282.6730776000. The cubic root of 39471981 is about 340.4836858587.

The spelling of 39471981 in words is "thirty-nine million, four hundred seventy-one thousand, nine hundred eighty-one".