734857021 has 4 divisors (see below), whose sum is σ = 734947200. Its totient is φ = 734766844.

The previous prime is 734857009. The next prime is 734857033. The reversal of 734857021 is 120758437.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120758437 = 389 ⋅310433.

It is an interprime number because it is at equal distance from previous prime (734857009) and next prime (734857033).

It is a cyclic number.

It is not a de Polignac number, because 734857021 - 2¹⁹ = 734332733 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 (734857621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31501 + ... + 49618.

It is an arithmetic number, because the mean of its divisors is an integer number (183736800).

Almost surely, 2^734857021 is an apocalyptic number.

It is an amenable number.

734857021 is a deficient number, since it is larger than the sum of its proper divisors (90179).

734857021 is an equidigital number, since it uses as much as digits as its factorization.

734857021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90178.

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 734857021 is about 27108.2463652668. The cubic root of 734857021 is about 902.4038703329.

The spelling of 734857021 in words is "seven hundred thirty-four million, eight hundred fifty-seven thousand, twenty-one".