401396689 has 4 divisors (see below), whose sum is σ = 402889140. Its totient is φ = 399904240.

The previous prime is 401396687. The next prime is 401396693. The reversal of 401396689 is 986693104.

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 142444225 + 258952464 = 11935^2 + 16092^2 .

It is a cyclic number.

It is not a de Polignac number, because 401396689 - 2¹ = 401396687 is a prime.

It is a super-2 number, since 2×401396689² = 322238603880325442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401396687) 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, 745822 + ... + 746359.

It is an arithmetic number, because the mean of its divisors is an integer number (100722285).

Almost surely, 2^401396689 is an apocalyptic number.

It is an amenable number.

401396689 is a deficient number, since it is larger than the sum of its proper divisors (1492451).

401396689 is a wasteful number, since it uses less digits than its factorization.

401396689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1492450.

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

The square root of 401396689 is about 20034.8867977835. The cubic root of 401396689 is about 737.6628779009.

The spelling of 401396689 in words is "four hundred one million, three hundred ninety-six thousand, six hundred eighty-nine".