403944820 has 24 divisors (see below), whose sum is σ = 898183944. Its totient is φ = 152073216.

The previous prime is 403944733. The next prime is 403944823. The reversal of 403944820 is 28449304.

It can be written as a sum of positive squares in 4 ways, for example, as 29986576 + 373958244 = 5476^2 + 19338^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (403944823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 593697 + ... + 594376.

It is an arithmetic number, because the mean of its divisors is an integer number (37424331).

Almost surely, 2^403944820 is an apocalyptic number.

It is an amenable number.

403944820 is an abundant number, since it is smaller than the sum of its proper divisors (494239124).

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

403944820 is a wasteful number, since it uses less digits than its factorization.

403944820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1188099 (or 1188097 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 403944820 is about 20098.3785415640. The cubic root of 403944820 is about 739.2205208356.

The spelling of 403944820 in words is "four hundred three million, nine hundred forty-four thousand, eight hundred twenty".