401566426 has 4 divisors (see below), whose sum is σ = 602349642. Its totient is φ = 200783212.

The previous prime is 401566411. The next prime is 401566427. The reversal of 401566426 is 624665104.

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

It can be written as a sum of positive squares in only one way, i.e., 384748225 + 16818201 = 19615^2 + 4101^2 .

It is a super-2 number, since 2×401566426² = 322511188980826952, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 401566391 and 401566400.

It is not an unprimeable number, because it can be changed into a prime (401566427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100391605 + ... + 100391608.

Almost surely, 2^401566426 is an apocalyptic number.

401566426 is a deficient number, since it is larger than the sum of its proper divisors (200783216).

401566426 is a wasteful number, since it uses less digits than its factorization.

401566426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200783215.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 401566426 is about 20039.1223859729. The cubic root of 401566426 is about 737.7668407574.

The spelling of 401566426 in words is "four hundred one million, five hundred sixty-six thousand, four hundred twenty-six".