74347421 has 4 divisors (see below), whose sum is σ = 75457152. Its totient is φ = 73237692.

The previous prime is 74347367. The next prime is 74347423. The reversal of 74347421 is 12474347.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74347421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74347423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 554765 + ... + 554898.

It is an arithmetic number, because the mean of its divisors is an integer number (18864288).

Almost surely, 2^74347421 is an apocalyptic number.

It is an amenable number.

74347421 is a deficient number, since it is larger than the sum of its proper divisors (1109731).

74347421 is a wasteful number, since it uses less digits than its factorization.

74347421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109730.

The product of its digits is 18816, while the sum is 32.

The square root of 74347421 is about 8622.4950565367. The cubic root of 74347421 is about 420.4896424753.

The spelling of 74347421 in words is "seventy-four million, three hundred forty-seven thousand, four hundred twenty-one".