745237421 has 4 divisors (see below), whose sum is σ = 777639072. Its totient is φ = 712835772.

The previous prime is 745237411. The next prime is 745237433. The reversal of 745237421 is 124732547.

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 not a de Polignac number, because 745237421 - 2¹⁸ = 744975277 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 (745237411) 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, 16200791 + ... + 16200836.

It is an arithmetic number, because the mean of its divisors is an integer number (194409768).

Almost surely, 2^745237421 is an apocalyptic number.

It is an amenable number.

745237421 is a deficient number, since it is larger than the sum of its proper divisors (32401651).

745237421 is a wasteful number, since it uses less digits than its factorization.

745237421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32401650.

The product of its digits is 47040, while the sum is 35.

The square root of 745237421 is about 27299.0369976672. The cubic root of 745237421 is about 906.6330600619.

Adding to 745237421 its reverse (124732547), we get a palindrome (869969968).

The spelling of 745237421 in words is "seven hundred forty-five million, two hundred thirty-seven thousand, four hundred twenty-one".