37961221 has 16 divisors (see below), whose sum is σ = 42586560. Its totient is φ = 33626880.

The previous prime is 37961207. The next prime is 37961227. The reversal of 37961221 is 12216973.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-37961221 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 (37961227) 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 15 ways as a sum of consecutive naturals, for example, 67875 + ... + 68431.

It is an arithmetic number, because the mean of its divisors is an integer number (2661660).

Almost surely, 2^37961221 is an apocalyptic number.

It is an amenable number.

37961221 is a deficient number, since it is larger than the sum of its proper divisors (4625339).

37961221 is a wasteful number, since it uses less digits than its factorization.

37961221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804.

The product of its digits is 4536, while the sum is 31.

The square root of 37961221 is about 6161.2678078460. The cubic root of 37961221 is about 336.0831385585.

The spelling of 37961221 in words is "thirty-seven million, nine hundred sixty-one thousand, two hundred twenty-one".