401794909 has 2 divisors, whose sum is σ = 401794910. Its totient is φ = 401794908.

The previous prime is 401794907. The next prime is 401794931. The reversal of 401794909 is 909497104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 261727684 + 140067225 = 16178^2 + 11835^2 .

It is a cyclic number.

It is not a de Polignac number, because 401794909 - 2¹ = 401794907 is a prime.

It is a super-2 number, since 2×401794909² = 322878297796636562, which contains 22 as substring.

Together with 401794907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401794901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200897454 + 200897455.

It is an arithmetic number, because the mean of its divisors is an integer number (200897455).

Almost surely, 2^401794909 is an apocalyptic number.

It is an amenable number.

401794909 is a deficient number, since it is larger than the sum of its proper divisors (1).

401794909 is an equidigital number, since it uses as much as digits as its factorization.

401794909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 401794909 is about 20044.8224985905. The cubic root of 401794909 is about 737.9067389244.

The spelling of 401794909 in words is "four hundred one million, seven hundred ninety-four thousand, nine hundred nine".