1997957502 has 80 divisors (see below), whose sum is σ = 4864780800. Its totient is φ = 610552080.

The previous prime is 1997957501. The next prime is 1997957531. The reversal of 1997957502 is 2057597991.

1997957502 is a `hidden beast` number, since 19 + 9 + 79 + 57 + 502 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997957501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 84949 + ... + 105887.

It is an arithmetic number, because the mean of its divisors is an integer number (60809760).

Almost surely, 2^1997957502 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1997957502, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2432390400).

1997957502 is an abundant number, since it is smaller than the sum of its proper divisors (2866823298).

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

1997957502 is a wasteful number, since it uses less digits than its factorization.

1997957502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21003 (or 20994 counting only the distinct ones).

The product of its (nonzero) digits is 1786050, while the sum is 54.

The square root of 1997957502 is about 44698.5178948922. The cubic root of 1997957502 is about 1259.4920061041.

The spelling of 1997957502 in words is "one billion, nine hundred ninety-seven million, nine hundred fifty-seven thousand, five hundred two".