37143721 has 8 divisors (see below), whose sum is σ = 37800000. Its totient is φ = 36491280.

The previous prime is 37143697. The next prime is 37143739. The reversal of 37143721 is 12734173.

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 37143721 - 2⁷ = 37143593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 37143721.

It is not an unprimeable number, because it can be changed into a prime (37143121) 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, 24030 + ... + 25528.

It is an arithmetic number, because the mean of its divisors is an integer number (4725000).

Almost surely, 2^37143721 is an apocalyptic number.

It is an amenable number.

37143721 is a deficient number, since it is larger than the sum of its proper divisors (656279).

37143721 is a wasteful number, since it uses less digits than its factorization.

37143721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1919.

The product of its digits is 3528, while the sum is 28.

The square root of 37143721 is about 6094.5648737215. The cubic root of 37143721 is about 333.6530784134.

Adding to 37143721 its reverse (12734173), we get a palindrome (49877894).

The spelling of 37143721 in words is "thirty-seven million, one hundred forty-three thousand, seven hundred twenty-one".