401787 has 16 divisors (see below), whose sum is σ = 622080. Its totient is φ = 255816.

The previous prime is 401773. The next prime is 401809. The reversal of 401787 is 787104.

It is not a de Polignac number, because 401787 - 2⁴ = 401771 is a prime.

It is a super-2 number, since 2×401787² = 322865586738, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 401787.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 401787.

It is not an unprimeable number, because it can be changed into a prime (401707) 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, 298 + ... + 944.

It is an arithmetic number, because the mean of its divisors is an integer number (38880).

2⁴⁰¹⁷⁸⁷ is an apocalyptic number.

401787 is a deficient number, since it is larger than the sum of its proper divisors (220293).

401787 is a wasteful number, since it uses less digits than its factorization.

401787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679 (or 673 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 401787 is about 633.8667052307. The cubic root of 401787 is about 73.7901897198.

The spelling of 401787 in words is "four hundred one thousand, seven hundred eighty-seven".