840470401 has 2 divisors, whose sum is σ = 840470402. Its totient is φ = 840470400.

The previous prime is 840470369. The next prime is 840470413. The reversal of 840470401 is 104074048.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 423330625 + 417139776 = 20575^2 + 20424^2 .

It is a cyclic number.

It is not a de Polignac number, because 840470401 - 2⁵ = 840470369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 840470401.

It is not a weakly prime, because it can be changed into another prime (840479401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420235200 + 420235201.

It is an arithmetic number, because the mean of its divisors is an integer number (420235201).

Almost surely, 2^840470401 is an apocalyptic number.

It is an amenable number.

840470401 is a deficient number, since it is larger than the sum of its proper divisors (1).

840470401 is an equidigital number, since it uses as much as digits as its factorization.

840470401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 840470401 is about 28990.8675447976. The cubic root of 840470401 is about 943.7148908127.

The spelling of 840470401 in words is "eight hundred forty million, four hundred seventy thousand, four hundred one".