37729961 has 2 divisors, whose sum is σ = 37729962. Its totient is φ = 37729960.

The previous prime is 37729943. The next prime is 37729981. The reversal of 37729961 is 16992773.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36421225 + 1308736 = 6035^2 + 1144^2 .

It is a cyclic number.

It is not a de Polignac number, because 37729961 - 2¹⁸ = 37467817 is a prime.

It is not a weakly prime, because it can be changed into another prime (37729931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18864980 + 18864981.

It is an arithmetic number, because the mean of its divisors is an integer number (18864981).

Almost surely, 2^37729961 is an apocalyptic number.

It is an amenable number.

37729961 is a deficient number, since it is larger than the sum of its proper divisors (1).

37729961 is an equidigital number, since it uses as much as digits as its factorization.

37729961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 142884, while the sum is 44.

The square root of 37729961 is about 6142.4718965576. The cubic root of 37729961 is about 335.3992744314.

The spelling of 37729961 in words is "thirty-seven million, seven hundred twenty-nine thousand, nine hundred sixty-one".