401215897 has 2 divisors, whose sum is σ = 401215898. Its totient is φ = 401215896.

The previous prime is 401215877. The next prime is 401215931. The reversal of 401215897 is 798512104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 319837456 + 81378441 = 17884^2 + 9021^2 .

It is a cyclic number.

It is not a de Polignac number, because 401215897 - 2²³ = 392827289 is a prime.

It is not a weakly prime, because it can be changed into another prime (401215847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200607948 + 200607949.

It is an arithmetic number, because the mean of its divisors is an integer number (200607949).

Almost surely, 2^401215897 is an apocalyptic number.

It is an amenable number.

401215897 is a deficient number, since it is larger than the sum of its proper divisors (1).

401215897 is an equidigital number, since it uses as much as digits as its factorization.

401215897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 401215897 is about 20030.3743599564. The cubic root of 401215897 is about 737.5521116869.

The spelling of 401215897 in words is "four hundred one million, two hundred fifteen thousand, eight hundred ninety-seven".