40646440 has 32 divisors (see below), whose sum is σ = 92369160. Its totient is φ = 16096000.

The previous prime is 40646401. The next prime is 40646443. The reversal of 40646440 is 4464604.

It can be written as a sum of positive squares in 4 ways, for example, as 39917124 + 729316 = 6318^2 + 854^2 .

It is a junction number, because it is equal to n+sod(n) for n = 40646399 and 40646408.

It is not an unprimeable number, because it can be changed into a prime (40646443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 991 + ... + 9070.

Almost surely, 2^40646440 is an apocalyptic number.

40646440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40646440 is an abundant number, since it is smaller than the sum of its proper divisors (51722720).

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

40646440 is a wasteful number, since it uses less digits than its factorization.

40646440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10173 (or 10169 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 40646440 is about 6375.4560621182. The cubic root of 40646440 is about 343.8276809567.

The spelling of 40646440 in words is "forty million, six hundred forty-six thousand, four hundred forty".