401620489 has 2 divisors, whose sum is σ = 401620490. Its totient is φ = 401620488.

The previous prime is 401620481. The next prime is 401620511. The reversal of 401620489 is 984026104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 376670464 + 24950025 = 19408^2 + 4995^2 .

It is a cyclic number.

It is not a de Polignac number, because 401620489 - 2³ = 401620481 is a prime.

It is a super-2 number, since 2×401620489² = 322598034369198242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (401620481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200810244 + 200810245.

It is an arithmetic number, because the mean of its divisors is an integer number (200810245).

Almost surely, 2^401620489 is an apocalyptic number.

It is an amenable number.

401620489 is a deficient number, since it is larger than the sum of its proper divisors (1).

401620489 is an equidigital number, since it uses as much as digits as its factorization.

401620489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 401620489 is about 20040.4712768937. The cubic root of 401620489 is about 737.7999478570.

It can be divided in two parts, 40 and 1620489, that added together give a square (1620529 = 1273²).

The spelling of 401620489 in words is "four hundred one million, six hundred twenty thousand, four hundred eighty-nine".