37981213 has 8 divisors (see below), whose sum is σ = 41602680. Its totient is φ = 34513920.

The previous prime is 37981201. The next prime is 37981219. The reversal of 37981213 is 31218973.

It can be written as a sum of positive squares in 4 ways, for example, as 16793604 + 21187609 = 4098^2 + 4603^2 .

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 37981213 - 2¹³ = 37973021 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 (37981219) 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 7 ways as a sum of consecutive naturals, for example, 38028 + ... + 39013.

It is an arithmetic number, because the mean of its divisors is an integer number (5200335).

Almost surely, 2^37981213 is an apocalyptic number.

It is an amenable number.

37981213 is a deficient number, since it is larger than the sum of its proper divisors (3621467).

37981213 is a wasteful number, since it uses less digits than its factorization.

37981213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77087.

The product of its digits is 9072, while the sum is 34.

The square root of 37981213 is about 6162.8899876600. The cubic root of 37981213 is about 336.1421267819.

The spelling of 37981213 in words is "thirty-seven million, nine hundred eighty-one thousand, two hundred thirteen".