1997640502 has 36 divisors (see below), whose sum is σ = 3544495524. Its totient is φ = 837027360.

The previous prime is 1997640481. The next prime is 1997640503. The reversal of 1997640502 is 2050467991.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997640503) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2724928 + ... + 2725660.

It is an arithmetic number, because the mean of its divisors is an integer number (98458209).

Almost surely, 2^1997640502 is an apocalyptic number.

1997640502 is a deficient number, since it is larger than the sum of its proper divisors (1546855022).

1997640502 is an equidigital number, since it uses as much as digits as its factorization.

1997640502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1505 (or 759 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 1997640502 is about 44694.9717753575. The cubic root of 1997640502 is about 1259.4253913933.

The spelling of 1997640502 in words is "one billion, nine hundred ninety-seven million, six hundred forty thousand, five hundred two".