401770820 has 36 divisors (see below), whose sum is σ = 927398892. Its totient is φ = 146097600.

The previous prime is 401770813. The next prime is 401770847. The reversal of 401770820 is 28077104.

It can be written as a sum of positive squares in 2 ways, for example, as 85784644 + 315986176 = 9262^2 + 17776^2 .

It is a super-2 number, since 2×401770820² = 322839583606944800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80591 + ... + 85430.

Almost surely, 2^401770820 is an apocalyptic number.

It is an amenable number.

401770820 is an abundant number, since it is smaller than the sum of its proper divisors (525628072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

401770820 is a wasteful number, since it uses less digits than its factorization.

401770820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166052 (or 166039 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 401770820 is about 20044.2216112275. The cubic root of 401770820 is about 737.8919919393.

The spelling of 401770820 in words is "four hundred one million, seven hundred seventy thousand, eight hundred twenty".