402000280 has 32 divisors (see below), whose sum is σ = 986729040. Its totient is φ = 146181760.

The previous prime is 402000251. The next prime is 402000293. The reversal of 402000280 is 82000204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 456379 + ... + 457258.

Almost surely, 2^402000280 is an apocalyptic number.

402000280 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402000280 is an abundant number, since it is smaller than the sum of its proper divisors (584728760).

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

402000280 is a wasteful number, since it uses less digits than its factorization.

402000280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913659 (or 913655 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 402000280 is about 20049.9446383276. The cubic root of 402000280 is about 738.0324405605.

Adding to 402000280 its reverse (82000204), we get a palindrome (484000484).

The spelling of 402000280 in words is "four hundred two million, two hundred eighty", and thus it is an aban number.