7900861 has 4 divisors (see below), whose sum is σ = 7915132. Its totient is φ = 7886592.

The previous prime is 7900859. The next prime is 7900873. The reversal of 7900861 is 1680097.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1680097 = 727 ⋅2311.

It can be written as a sum of positive squares in 2 ways, for example, as 7873636 + 27225 = 2806^2 + 165^2 .

It is a cyclic number.

It is not a de Polignac number, because 7900861 - 2¹ = 7900859 is a prime.

It is a Duffinian number.

7900861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7900811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6270 + ... + 7423.

It is an arithmetic number, because the mean of its divisors is an integer number (1978783).

Almost surely, 2^7900861 is an apocalyptic number.

It is an amenable number.

7900861 is a deficient number, since it is larger than the sum of its proper divisors (14271).

7900861 is a wasteful number, since it uses less digits than its factorization.

7900861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14270.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 7900861 is about 2810.8470253644. The cubic root of 7900861 is about 199.1704052876.

The spelling of 7900861 in words is "seven million, nine hundred thousand, eight hundred sixty-one".