9402640 has 40 divisors (see below), whose sum is σ = 23545368. Its totient is φ = 3471360.

The previous prime is 9402623. The next prime is 9402643. The reversal of 9402640 is 462049.

It can be written as a sum of positive squares in 4 ways, for example, as 1982464 + 7420176 = 1408^2 + 2724^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (9402643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3481 + ... + 5560.

Almost surely, 2^9402640 is an apocalyptic number.

It is an amenable number.

9402640 is an abundant number, since it is smaller than the sum of its proper divisors (14142728).

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

9402640 is a wasteful number, since it uses less digits than its factorization.

9402640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9067 (or 9061 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 9402640 is about 3066.3724496545. The cubic root of 9402640 is about 211.0651850441.

Adding to 9402640 its reverse (462049), we get a palindrome (9864689).

The spelling of 9402640 in words is "nine million, four hundred two thousand, six hundred forty".