40661940 has 48 divisors (see below), whose sum is σ = 124205760. Its totient is φ = 9857280.

The previous prime is 40661939. The next prime is 40661941. The reversal of 40661940 is 4916604.

It is an interprime number because it is at equal distance from previous prime (40661939) and next prime (40661941).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 40661898 and 40661907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40661941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30145 + ... + 31464.

It is an arithmetic number, because the mean of its divisors is an integer number (2587620).

Almost surely, 2^40661940 is an apocalyptic number.

It is an amenable number.

40661940 is an abundant number, since it is smaller than the sum of its proper divisors (83543820).

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

40661940 is a wasteful number, since it uses less digits than its factorization.

40661940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61632 (or 61630 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 40661940 is about 6376.6715455636. The cubic root of 40661940 is about 343.8713801652.

It can be divided in two parts, 4066 and 1940, that added together give a palindrome (6006).

The spelling of 40661940 in words is "forty million, six hundred sixty-one thousand, nine hundred forty".