74123721 has 48 divisors (see below), whose sum is σ = 128865600. Its totient is φ = 41985216.

The previous prime is 74123717. The next prime is 74123771. The reversal of 74123721 is 12732147.

It is a happy number.

It is not a de Polignac number, because 74123721 - 2² = 74123717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (74123771) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 236661 + ... + 236973.

It is an arithmetic number, because the mean of its divisors is an integer number (2684700).

Almost surely, 2^74123721 is an apocalyptic number.

It is an amenable number.

74123721 is a deficient number, since it is larger than the sum of its proper divisors (54741879).

74123721 is a wasteful number, since it uses less digits than its factorization.

74123721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515 (or 502 counting only the distinct ones).

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

The square root of 74123721 is about 8609.5134008839. The cubic root of 74123721 is about 420.0674891547.

Adding to 74123721 its reverse (12732147), we get a palindrome (86855868).

The spelling of 74123721 in words is "seventy-four million, one hundred twenty-three thousand, seven hundred twenty-one".