74221137 has 8 divisors (see below), whose sum is σ = 109957280. Its totient is φ = 49480740.

The previous prime is 74221127. The next prime is 74221151. The reversal of 74221137 is 73112247.

It is a happy number.

It is not a de Polignac number, because 74221137 - 2¹⁹ = 73696849 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2748931 = 74221137 / (7 + 4 + 2 + 2 + 1 + 1 + 3 + 7).

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 74221137.

It is not an unprimeable number, because it can be changed into a prime (74221127) 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, 1374439 + ... + 1374492.

It is an arithmetic number, because the mean of its divisors is an integer number (13744660).

Almost surely, 2^74221137 is an apocalyptic number.

It is an amenable number.

74221137 is a deficient number, since it is larger than the sum of its proper divisors (35736143).

74221137 is a wasteful number, since it uses less digits than its factorization.

74221137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2748940 (or 2748934 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 74221137 is about 8615.1690058872. The cubic root of 74221137 is about 420.2514310845.

The spelling of 74221137 in words is "seventy-four million, two hundred twenty-one thousand, one hundred thirty-seven".