37991145 has 16 divisors (see below), whose sum is σ = 62200512. Its totient is φ = 19790400.

The previous prime is 37991143. The next prime is 37991159. The reversal of 37991145 is 54119973.

It is a happy number.

37991145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 37991145 - 2¹ = 37991143 is a prime.

It is a super-2 number, since 2×37991145² = 2886654196822050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (37991143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28806 + ... + 30095.

It is an arithmetic number, because the mean of its divisors is an integer number (3887532).

Almost surely, 2^37991145 is an apocalyptic number.

It is an amenable number.

37991145 is a deficient number, since it is larger than the sum of its proper divisors (24209367).

37991145 is a wasteful number, since it uses less digits than its factorization.

37991145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58952.

The product of its digits is 34020, while the sum is 39.

The square root of 37991145 is about 6163.6957257801. The cubic root of 37991145 is about 336.1714243598.

The spelling of 37991145 in words is "thirty-seven million, nine hundred ninety-one thousand, one hundred forty-five".