40681944 has 48 divisors (see below), whose sum is σ = 113165520. Its totient is φ = 13193280.

The previous prime is 40681943. The next prime is 40682011. The reversal of 40681944 is 44918604.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 40681899 and 40681908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40681943) 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, 4972 + ... + 10299.

It is an arithmetic number, because the mean of its divisors is an integer number (2357615).

Almost surely, 2^40681944 is an apocalyptic number.

It is an amenable number.

40681944 is an abundant number, since it is smaller than the sum of its proper divisors (72483576).

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

40681944 is a wasteful number, since it uses less digits than its factorization.

40681944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15320 (or 15313 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 40681944 is about 6378.2398826008. The cubic root of 40681944 is about 343.9277611066.

The spelling of 40681944 in words is "forty million, six hundred eighty-one thousand, nine hundred forty-four".