901640 has 16 divisors (see below), whose sum is σ = 2028780. Its totient is φ = 360640.

The previous prime is 901613. The next prime is 901643. The reversal of 901640 is 46109.

It can be written as a sum of positive squares in 2 ways, for example, as 894916 + 6724 = 946^2 + 82^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (901643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11231 + ... + 11310.

2⁹⁰¹⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

901640 is an abundant number, since it is smaller than the sum of its proper divisors (1127140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

901640 is a wasteful number, since it uses less digits than its factorization.

901640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22552 (or 22548 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 901640 is about 949.5472605405. The cubic root of 901640 is about 96.6075474159.

Adding to 901640 its reverse (46109), we get a palindrome (947749).

The spelling of 901640 in words is "nine hundred one thousand, six hundred forty".