401989849 has 4 divisors (see below), whose sum is σ = 402044580. Its totient is φ = 401935120.

The previous prime is 401989823. The next prime is 401989937. The reversal of 401989849 is 948989104.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27373824 + 374616025 = 5232^2 + 19355^2 .

It is a cyclic number.

It is not a de Polignac number, because 401989849 - 2¹⁷ = 401858777 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 401989796 and 401989805.

It is not an unprimeable number, because it can be changed into a prime (401989249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14254 + ... + 31735.

It is an arithmetic number, because the mean of its divisors is an integer number (100511145).

Almost surely, 2^401989849 is an apocalyptic number.

It is an amenable number.

401989849 is a deficient number, since it is larger than the sum of its proper divisors (54731).

401989849 is an equidigital number, since it uses as much as digits as its factorization.

401989849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54730.

The product of its (nonzero) digits is 746496, while the sum is 52.

The square root of 401989849 is about 20049.6845112336. The cubic root of 401989849 is about 738.0260570799.

The spelling of 401989849 in words is "four hundred one million, nine hundred eighty-nine thousand, eight hundred forty-nine".