43940401 has 2 divisors, whose sum is σ = 43940402. Its totient is φ = 43940400.

The previous prime is 43940387. The next prime is 43940411. The reversal of 43940401 is 10404934.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35988001 + 7952400 = 5999^2 + 2820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43940401 is a prime.

It is not a weakly prime, because it can be changed into another prime (43940411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21970200 + 21970201.

It is an arithmetic number, because the mean of its divisors is an integer number (21970201).

Almost surely, 2^43940401 is an apocalyptic number.

It is an amenable number.

43940401 is a deficient number, since it is larger than the sum of its proper divisors (1).

43940401 is an equidigital number, since it uses as much as digits as its factorization.

43940401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 43940401 is about 6628.7556147440. The cubic root of 43940401 is about 352.8753636072.

The spelling of 43940401 in words is "forty-three million, nine hundred forty thousand, four hundred one".