401643776 has 18 divisors (see below), whose sum is σ = 801719142. Its totient is φ = 200821760.

The previous prime is 401643757. The next prime is 401643799. The reversal of 401643776 is 677346104.

It can be written as a sum of positive squares in only one way, i.e., 375429376 + 26214400 = 19376^2 + 5120^2 .

It is a super-2 number, since 2×401643776² = 322635445599076352, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 784205 + ... + 784716.

Almost surely, 2^401643776 is an apocalyptic number.

It is an amenable number.

401643776 is a deficient number, since it is larger than the sum of its proper divisors (400075366).

401643776 is an equidigital number, since it uses as much as digits as its factorization.

401643776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1568937 (or 1568923 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 38.

The square root of 401643776 is about 20041.0522677827. The cubic root of 401643776 is about 737.8142074343.

The spelling of 401643776 in words is "four hundred one million, six hundred forty-three thousand, seven hundred seventy-six".