40185812 has 12 divisors (see below), whose sum is σ = 70370580. Its totient is φ = 20079936.

The previous prime is 40185809. The next prime is 40185869. The reversal of 40185812 is 21858104.

It can be written as a sum of positive squares in 2 ways, for example, as 10982596 + 29203216 = 3314^2 + 5404^2 .

It is a super-2 number, since 2×40185812² = 3229798972198688, which contains 22 as substring.

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, 8264 + ... + 12192.

It is an arithmetic number, because the mean of its divisors is an integer number (5864215).

Almost surely, 2^40185812 is an apocalyptic number.

It is an amenable number.

40185812 is a deficient number, since it is larger than the sum of its proper divisors (30184768).

40185812 is a wasteful number, since it uses less digits than its factorization.

40185812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6490 (or 6488 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 40185812 is about 6339.2280287114. The cubic root of 40185812 is about 342.5239282126.

The spelling of 40185812 in words is "forty million, one hundred eighty-five thousand, eight hundred twelve".