43723697940 has 480 divisors, whose sum is σ = 157026481920. Its totient is φ = 10095611904.

The previous prime is 43723697933. The next prime is 43723697947. The reversal of 43723697940 is 4979632734.

43723697940 is a `hidden beast` number, since 437 + 2 + 36 + 97 + 94 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (43723697933) and next prime (43723697947).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43723697947) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 45215337 + ... + 45216303.

It is an arithmetic number, because the mean of its divisors is an integer number (327138504).

Almost surely, 2^43723697940 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43723697940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78513240960).

43723697940 is an abundant number, since it is smaller than the sum of its proper divisors (113302783980).

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

43723697940 is a wasteful number, since it uses less digits than its factorization.

43723697940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133 (or 1122 counting only the distinct ones).

The product of its (nonzero) digits is 6858432, while the sum is 54.

The spelling of 43723697940 in words is "forty-three billion, seven hundred twenty-three million, six hundred ninety-seven thousand, nine hundred forty".