1402640 has 40 divisors (see below), whose sum is σ = 3314520. Its totient is φ = 551936.

The previous prime is 1402603. The next prime is 1402673. The reversal of 1402640 is 462041.

It can be written as a sum of positive squares in 4 ways, for example, as 295936 + 1106704 = 544^2 + 1052^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7022 + ... + 7218.

It is an arithmetic number, because the mean of its divisors is an integer number (82863).

2^1402640 is an apocalyptic number.

1402640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1402640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1657260).

1402640 is an abundant number, since it is smaller than the sum of its proper divisors (1911880).

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

1402640 is a wasteful number, since it uses less digits than its factorization.

1402640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1402640 is about 1184.3310348040. The cubic root of 1402640 is about 111.9391676454.

Adding to 1402640 its reverse (462041), we get a palindrome (1864681).

The spelling of 1402640 in words is "one million, four hundred two thousand, six hundred forty".