401994469 has 2 divisors, whose sum is σ = 401994470. Its totient is φ = 401994468.

The previous prime is 401994413. The next prime is 401994493. The reversal of 401994469 is 964499104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218744100 + 183250369 = 14790^2 + 13537^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401994469 is a prime.

It is a super-2 number, since 2×401994469² = 323199106213183922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401994269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200997234 + 200997235.

It is an arithmetic number, because the mean of its divisors is an integer number (200997235).

Almost surely, 2^401994469 is an apocalyptic number.

It is an amenable number.

401994469 is a deficient number, since it is larger than the sum of its proper divisors (1).

401994469 is an equidigital number, since it uses as much as digits as its factorization.

401994469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 401994469 is about 20049.7997246855. The cubic root of 401994469 is about 738.0288844045.

The spelling of 401994469 in words is "four hundred one million, nine hundred ninety-four thousand, four hundred sixty-nine".