401770987 has 4 divisors (see below), whose sum is σ = 403495560. Its totient is φ = 400046416.

The previous prime is 401770981. The next prime is 401770997. The reversal of 401770987 is 789077104.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401770987 is a prime.

It is a super-2 number, since 2×401770987² = 322839851989908338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401770981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 861937 + ... + 862402.

It is an arithmetic number, because the mean of its divisors is an integer number (100873890).

Almost surely, 2^401770987 is an apocalyptic number.

401770987 is a deficient number, since it is larger than the sum of its proper divisors (1724573).

401770987 is a wasteful number, since it uses less digits than its factorization.

401770987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1724572.

The product of its (nonzero) digits is 98784, while the sum is 43.

The square root of 401770987 is about 20044.2257770162. The cubic root of 401770987 is about 737.8920941766.

The spelling of 401770987 in words is "four hundred one million, seven hundred seventy thousand, nine hundred eighty-seven".