7402709521 has 9 divisors (see below), whose sum is σ = 7488255099. Its totient is φ = 7318133184.

The previous prime is 7402709471. The next prime is 7402709533. The reversal of 7402709521 is 1259072047.

The square root of 7402709521 is 86039.

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

It can be written as a sum of positive squares in only one way, i.e., 3324099025 + 4078610496 = 57655^2 + 63864^2 .

It is not a de Polignac number, because 7402709521 - 2²¹ = 7400612369 is a prime.

It is a super-3 number, since 3×7402709521³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7402703521) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8345340 + ... + 8346226.

Almost surely, 2^7402709521 is an apocalyptic number.

7402709521 is the 86039-th square number.

7402709521 is the 43020-th centered octagonal number.

It is an amenable number.

7402709521 is a deficient number, since it is larger than the sum of its proper divisors (85545578).

7402709521 is an frugal number, since it uses more digits than its factorization.

7402709521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1968 (or 984 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 37.

The cubic root of 7402709521 is about 1948.9329705621.

The spelling of 7402709521 in words is "seven billion, four hundred two million, seven hundred nine thousand, five hundred twenty-one".