39137981 has 8 divisors (see below), whose sum is σ = 40097280. Its totient is φ = 38184048.

The previous prime is 39137947. The next prime is 39137999. The reversal of 39137981 is 18973193.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 39137981 - 2¹⁰ = 39136957 is a prime.

It is a super-2 number, since 2×39137981² = 3063563113512722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39134981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16115 + ... + 18383.

It is an arithmetic number, because the mean of its divisors is an integer number (5012160).

Almost surely, 2^39137981 is an apocalyptic number.

It is an amenable number.

39137981 is a deficient number, since it is larger than the sum of its proper divisors (959299).

39137981 is a wasteful number, since it uses less digits than its factorization.

39137981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2683.

The product of its digits is 40824, while the sum is 41.

The square root of 39137981 is about 6256.0355657557. The cubic root of 39137981 is about 339.5206075453.

The spelling of 39137981 in words is "thirty-nine million, one hundred thirty-seven thousand, nine hundred eighty-one".