7390420645 has 4 divisors (see below), whose sum is σ = 8868504780. Its totient is φ = 5912336512.

The previous prime is 7390420637. The next prime is 7390420721. The reversal of 7390420645 is 5460240937.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5460240937 = 181 ⋅30167077.

It can be written as a sum of positive squares in 2 ways, for example, as 5543398116 + 1847022529 = 74454^2 + 42977^2 .

It is a cyclic number.

It is not a de Polignac number, because 7390420645 - 2³ = 7390420637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7390420598 and 7390420607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 739042060 + ... + 739042069.

It is an arithmetic number, because the mean of its divisors is an integer number (2217126195).

Almost surely, 2^7390420645 is an apocalyptic number.

It is an amenable number.

7390420645 is a deficient number, since it is larger than the sum of its proper divisors (1478084135).

7390420645 is a wasteful number, since it uses less digits than its factorization.

7390420645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1478084134.

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 7390420645 is about 85967.5557696042. Note that the first 3 decimals coincide. The cubic root of 7390420645 is about 1947.8539304878.

It can be divided in two parts, 73904 and 20645, that added together give a palindrome (94549).

The spelling of 7390420645 in words is "seven billion, three hundred ninety million, four hundred twenty thousand, six hundred forty-five".