740438521 has 3 divisors (see below), whose sum is σ = 740465733. Its totient is φ = 740411310.

The previous prime is 740438509. The next prime is 740438551. The reversal of 740438521 is 125834047.

The square root of 740438521 is 27211.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 125834047 = 191 ⋅658817.

It is not a de Polignac number, because 740438521 - 2¹⁹ = 739914233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (740438551) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 13606 + ... + 40816.

It is an arithmetic number, because the mean of its divisors is an integer number (246821911).

Almost surely, 2^740438521 is an apocalyptic number.

740438521 is the 27211-st square number.

740438521 is the 13606-th centered octagonal number.

It is an amenable number.

740438521 is a deficient number, since it is larger than the sum of its proper divisors (27212).

740438521 is an frugal number, since it uses more digits than its factorization.

740438521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54422 (or 27211 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The cubic root of 740438521 is about 904.6828028712.

The spelling of 740438521 in words is "seven hundred forty million, four hundred thirty-eight thousand, five hundred twenty-one".