1031402640 has 80 divisors (see below), whose sum is σ = 3249809856. Its totient is φ = 270528000.

The previous prime is 1031402633. The next prime is 1031402651. The reversal of 1031402640 is 462041301.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20586 + ... + 49865.

Almost surely, 2^1031402640 is an apocalyptic number.

1031402640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1031402640 is an abundant number, since it is smaller than the sum of its proper divisors (2218407216).

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

1031402640 is a wasteful number, since it uses less digits than its factorization.

1031402640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70528 (or 70522 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1031402640 is about 32115.4579603032. The cubic root of 1031402640 is about 1010.3598495551.

Adding to 1031402640 its reverse (462041301), we get a palindrome (1493443941).

The spelling of 1031402640 in words is "one billion, thirty-one million, four hundred two thousand, six hundred forty".