74140421 has 2 divisors, whose sum is σ = 74140422. Its totient is φ = 74140420.

The previous prime is 74140399. The next prime is 74140433. The reversal of 74140421 is 12404147.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65788321 + 8352100 = 8111^2 + 2890^2 .

It is a cyclic number.

It is not a de Polignac number, because 74140421 - 2⁶ = 74140357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74140021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37070210 + 37070211.

It is an arithmetic number, because the mean of its divisors is an integer number (37070211).

Almost surely, 2^74140421 is an apocalyptic number.

It is an amenable number.

74140421 is a deficient number, since it is larger than the sum of its proper divisors (1).

74140421 is an equidigital number, since it uses as much as digits as its factorization.

74140421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 74140421 is about 8610.4832036303. The cubic root of 74140421 is about 420.0990337138.

Adding to 74140421 its reverse (12404147), we get a palindrome (86544568).

The spelling of 74140421 in words is "seventy-four million, one hundred forty thousand, four hundred twenty-one".