402443980 has 12 divisors (see below), whose sum is σ = 845132400. Its totient is φ = 160977584.

The previous prime is 402443957. The next prime is 402443989. The reversal of 402443980 is 89344204.

It is a super-2 number, since 2×402443980² = 323922314076480800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (402443989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10061080 + ... + 10061119.

It is an arithmetic number, because the mean of its divisors is an integer number (70427700).

Almost surely, 2^402443980 is an apocalyptic number.

It is an amenable number.

402443980 is an abundant number, since it is smaller than the sum of its proper divisors (442688420).

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

402443980 is a wasteful number, since it uses less digits than its factorization.

402443980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20122208 (or 20122206 counting only the distinct ones).

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

The square root of 402443980 is about 20061.0064553103. The cubic root of 402443980 is about 738.3038703798.

The spelling of 402443980 in words is "four hundred two million, four hundred forty-three thousand, nine hundred eighty".