7390289809 has 6 divisors (see below), whose sum is σ = 8596867794. Its totient is φ = 6334534080.

The previous prime is 7390289807. The next prime is 7390289821. The reversal of 7390289809 is 9089820937.

It can be written as a sum of positive squares in only one way, i.e., 7387918209 + 2371600 = 85953^2 + 1540^2 .

It is not a de Polignac number, because 7390289809 - 2¹ = 7390289807 is a prime.

It is a super-2 number, since 2×7390289809² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7390289809.

It is not an unprimeable number, because it can be changed into a prime (7390289807) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 75411072 + ... + 75411169.

It is an arithmetic number, because the mean of its divisors is an integer number (1432811299).

Almost surely, 2^7390289809 is an apocalyptic number.

It is an amenable number.

7390289809 is a deficient number, since it is larger than the sum of its proper divisors (1206577985).

7390289809 is a wasteful number, since it uses less digits than its factorization.

7390289809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150822255 (or 150822248 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 55.

The square root of 7390289809 is about 85966.7948047384. The cubic root of 7390289809 is about 1947.8424358367.

The spelling of 7390289809 in words is "seven billion, three hundred ninety million, two hundred eighty-nine thousand, eight hundred nine".