402841987 has 16 divisors (see below), whose sum is σ = 442025280. Its totient is φ = 365904000.

The previous prime is 402841981. The next prime is 402841997. The reversal of 402841987 is 789148204.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402841987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402841981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35737 + ... + 45637.

It is an arithmetic number, because the mean of its divisors is an integer number (27626580).

Almost surely, 2^402841987 is an apocalyptic number.

402841987 is a deficient number, since it is larger than the sum of its proper divisors (39183293).

402841987 is a wasteful number, since it uses less digits than its factorization.

402841987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10014.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 402841987 is about 20070.9239199395. The cubic root of 402841987 is about 738.5471781909.

It can be divided in two parts, 4028 and 41987, that multiplied together give a triangular number (169123636 = T₁₈₃₉₁).

The spelling of 402841987 in words is "four hundred two million, eight hundred forty-one thousand, nine hundred eighty-seven".