40684240 has 40 divisors (see below), whose sum is σ = 98707968. Its totient is φ = 15565440.

The previous prime is 40684223. The next prime is 40684271. The reversal of 40684240 is 4248604.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 40684199 and 40684208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9216 + ... + 12895.

Almost surely, 2^40684240 is an apocalyptic number.

40684240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40684240 is an abundant number, since it is smaller than the sum of its proper divisors (58023728).

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

40684240 is a wasteful number, since it uses less digits than its factorization.

40684240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22147 (or 22141 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

The square root of 40684240 is about 6378.4198670204. The cubic root of 40684240 is about 343.9342311619.

The spelling of 40684240 in words is "forty million, six hundred eighty-four thousand, two hundred forty".