7400388861 has 6 divisors (see below), whose sum is σ = 10689450590. Its totient is φ = 4933592568.

The previous prime is 7400388857. The next prime is 7400388883. The reversal of 7400388861 is 1688830047.

It can be written as a sum of positive squares in only one way, i.e., 7043405625 + 356983236 = 83925^2 + 18894^2 .

It is not a de Polignac number, because 7400388861 - 2² = 7400388857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7400388661) 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, 411132706 + ... + 411132723.

Almost surely, 2^7400388861 is an apocalyptic number.

It is an amenable number.

7400388861 is a deficient number, since it is larger than the sum of its proper divisors (3289061729).

7400388861 is a wasteful number, since it uses less digits than its factorization.

7400388861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822265435 (or 822265432 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 7400388861 is about 86025.5128493867. The cubic root of 7400388861 is about 1948.7292936303.

The spelling of 7400388861 in words is "seven billion, four hundred million, three hundred eighty-eight thousand, eight hundred sixty-one".