402878144 has 14 divisors (see below), whose sum is σ = 799461444. Its totient is φ = 201439040.

The previous prime is 402878141. The next prime is 402878149. The reversal of 402878144 is 441878204.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 402878098 and 402878107.

It is not an unprimeable number, because it can be changed into a prime (402878141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3147422 + ... + 3147549.

Almost surely, 2^402878144 is an apocalyptic number.

It is an amenable number.

402878144 is a deficient number, since it is larger than the sum of its proper divisors (396583300).

402878144 is an equidigital number, since it uses as much as digits as its factorization.

402878144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6294983 (or 6294973 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 38.

The square root of 402878144 is about 20071.8246305611. The cubic root of 402878144 is about 738.5692735801.

The spelling of 402878144 in words is "four hundred two million, eight hundred seventy-eight thousand, one hundred forty-four".