987635401 has 4 divisors (see below), whose sum is σ = 987990804. Its totient is φ = 987280000.

The previous prime is 987635399. The next prime is 987635423. The reversal of 987635401 is 104536789.

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

It can be written as a sum of positive squares in 2 ways, for example, as 263218176 + 724417225 = 16224^2 + 26915^2 .

It is a cyclic number.

It is not a de Polignac number, because 987635401 - 2¹ = 987635399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (987635471) 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, 173500 + ... + 179101.

It is an arithmetic number, because the mean of its divisors is an integer number (246997701).

Almost surely, 2^987635401 is an apocalyptic number.

It is an amenable number.

987635401 is a deficient number, since it is larger than the sum of its proper divisors (355403).

987635401 is a wasteful number, since it uses less digits than its factorization.

987635401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355402.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 987635401 is about 31426.6670361335. The cubic root of 987635401 is about 995.8613623074.

It can be divided in two parts, 987635 and 401, that added together give a square (988036 = 994²).

The spelling of 987635401 in words is "nine hundred eighty-seven million, six hundred thirty-five thousand, four hundred one".