745738421 has 4 divisors (see below), whose sum is σ = 745967232. Its totient is φ = 745509612.

The previous prime is 745738397. The next prime is 745738423. The reversal of 745738421 is 124837547.

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 745738421 - 2²² = 741544117 is a prime.

It is a super-2 number, since 2×745738421² = 1112251585111146482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745738423) 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, 109445 + ... + 116058.

It is an arithmetic number, because the mean of its divisors is an integer number (186491808).

Almost surely, 2^745738421 is an apocalyptic number.

It is an amenable number.

745738421 is a deficient number, since it is larger than the sum of its proper divisors (228811).

745738421 is a wasteful number, since it uses less digits than its factorization.

745738421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228810.

The product of its digits is 188160, while the sum is 41.

The square root of 745738421 is about 27308.2116038381. The cubic root of 745738421 is about 906.8361816451.

The spelling of 745738421 in words is "seven hundred forty-five million, seven hundred thirty-eight thousand, four hundred twenty-one".