401003987 has 4 divisors (see below), whose sum is σ = 422109480. Its totient is φ = 379898496.

The previous prime is 401003971. The next prime is 401004001. The reversal of 401003987 is 789300104.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 401003987 - 2⁴ = 401003971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401003947) 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, 10552718 + ... + 10552755.

It is an arithmetic number, because the mean of its divisors is an integer number (105527370).

Almost surely, 2^401003987 is an apocalyptic number.

401003987 is a deficient number, since it is larger than the sum of its proper divisors (21105493).

401003987 is a wasteful number, since it uses less digits than its factorization.

401003987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21105492.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 401003987 is about 20025.0839448927. The cubic root of 401003987 is about 737.4222379755.

The spelling of 401003987 in words is "four hundred one million, three thousand, nine hundred eighty-seven".