400880489 has 2 divisors, whose sum is σ = 400880490. Its totient is φ = 400880488.

The previous prime is 400880479. The next prime is 400880507. The reversal of 400880489 is 984088004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 400800400 + 80089 = 20020^2 + 283^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400880489 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (400880479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200440244 + 200440245.

It is an arithmetic number, because the mean of its divisors is an integer number (200440245).

Almost surely, 2^400880489 is an apocalyptic number.

It is an amenable number.

400880489 is a deficient number, since it is larger than the sum of its proper divisors (1).

400880489 is an equidigital number, since it uses as much as digits as its factorization.

400880489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73728, while the sum is 41.

The square root of 400880489 is about 20022.0001248627. Note that the first 3 decimals coincide. The cubic root of 400880489 is about 737.3465284023.

The spelling of 400880489 in words is "four hundred million, eight hundred eighty thousand, four hundred eighty-nine".