401858369929 has 3 divisors (see below), whose sum is σ = 401859003853. Its totient is φ = 401857736006.

The previous prime is 401858369917. The next prime is 401858369933. The reversal of 401858369929 is 929963858104.

The square root of 401858369929 is 633923.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 401858369929 - 2¹¹ = 401858367881 is a prime.

It is a super-2 number, since 2×401858369929² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401858369909) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 316962 + ... + 950884.

Almost surely, 2^401858369929 is an apocalyptic number.

401858369929 is the 633923-rd square number.

401858369929 is the 316962-nd centered octagonal number.

It is an amenable number.

401858369929 is a deficient number, since it is larger than the sum of its proper divisors (633924).

401858369929 is an frugal number, since it uses more digits than its factorization.

401858369929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1267846 (or 633923 counting only the distinct ones).

The product of its (nonzero) digits is 33592320, while the sum is 64.

Multiplying 401858369929 by its sum of digits (64), we get a square (25718935675456 = 5071384²).

The spelling of 401858369929 in words is "four hundred one billion, eight hundred fifty-eight million, three hundred sixty-nine thousand, nine hundred twenty-nine".