1975143640 has 32 divisors (see below), whose sum is σ = 4705490880. Its totient is φ = 743583232.

The previous prime is 1975143637. The next prime is 1975143707. The reversal of 1975143640 is 463415791.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 1975143593 and 1975143602.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 1451632 + ... + 1452991.

It is an arithmetic number, because the mean of its divisors is an integer number (147046590).

Almost surely, 2^1975143640 is an apocalyptic number.

1975143640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1975143640 is an abundant number, since it is smaller than the sum of its proper divisors (2730347240).

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

1975143640 is a wasteful number, since it uses less digits than its factorization.

1975143640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2904651 (or 2904647 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 1975143640 is about 44442.5881334560. The cubic root of 1975143640 is about 1254.6797678211.

The spelling of 1975143640 in words is "one billion, nine hundred seventy-five million, one hundred forty-three thousand, six hundred forty".