400061617 has 2 divisors, whose sum is σ = 400061618. Its totient is φ = 400061616.

The previous prime is 400061593. The next prime is 400061633. The reversal of 400061617 is 716160004.

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., 312900721 + 87160896 = 17689^2 + 9336^2 .

It is a cyclic number.

It is not a de Polignac number, because 400061617 - 2¹⁹ = 399537329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400061591 and 400061600.

It is not a weakly prime, because it can be changed into another prime (400061677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200030808 + 200030809.

It is an arithmetic number, because the mean of its divisors is an integer number (200030809).

Almost surely, 2^400061617 is an apocalyptic number.

It is an amenable number.

400061617 is a deficient number, since it is larger than the sum of its proper divisors (1).

400061617 is an equidigital number, since it uses as much as digits as its factorization.

400061617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 400061617 is about 20001.5403656818. The cubic root of 400061617 is about 736.8441309471.

The spelling of 400061617 in words is "four hundred million, sixty-one thousand, six hundred seventeen".