1020140440 has 32 divisors (see below), whose sum is σ = 2503982160. Its totient is φ = 370960000.

The previous prime is 1020140423. The next prime is 1020140491. The reversal of 1020140440 is 440410201.

It is a congruent number.

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, 1158811 + ... + 1159690.

Almost surely, 2^1020140440 is an apocalyptic number.

1020140440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020140440 is an abundant number, since it is smaller than the sum of its proper divisors (1483841720).

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

1020140440 is a wasteful number, since it uses less digits than its factorization.

1020140440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2318523 (or 2318519 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1020140440 is about 31939.6374431520. The cubic root of 1020140440 is about 1006.6689068168.

Adding to 1020140440 its reverse (440410201), we get a palindrome (1460550641).

The spelling of 1020140440 in words is "one billion, twenty million, one hundred forty thousand, four hundred forty".