7405866 has 24 divisors (see below), whose sum is σ = 17280900. Its totient is φ = 2278656.

The previous prime is 7405861. The next prime is 7405891. The reversal of 7405866 is 6685047.

It is a happy number.

7405866 is a `hidden beast` number, since 74 + 0 + 586 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7403841 + 2025 = 2721^2 + 45^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7405866.

It is not an unprimeable number, because it can be changed into a prime (7405861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15591 + ... + 16058.

Almost surely, 2^7405866 is an apocalyptic number.

7405866 is an abundant number, since it is smaller than the sum of its proper divisors (9875034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7405866 is a wasteful number, since it uses less digits than its factorization.

7405866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31670 (or 31667 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 7405866 is about 2721.3720804036. The cubic root of 7405866 is about 194.9209936351.

The spelling of 7405866 in words is "seven million, four hundred five thousand, eight hundred sixty-six".