1997205015 has 16 divisors (see below), whose sum is σ = 3441338208. Its totient is φ = 983239296.

The previous prime is 1997204987. The next prime is 1997205037. The reversal of 1997205015 is 5105027991.

It is not a de Polignac number, because 1997205015 - 2⁵ = 1997204983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5120844 + ... + 5121233.

It is an arithmetic number, because the mean of its divisors is an integer number (215083638).

Almost surely, 2^1997205015 is an apocalyptic number.

1997205015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1997205015 is a deficient number, since it is larger than the sum of its proper divisors (1444133193).

1997205015 is a wasteful number, since it uses less digits than its factorization.

1997205015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10242098.

The product of its (nonzero) digits is 28350, while the sum is 39.

The square root of 1997205015 is about 44690.0997425604. The cubic root of 1997205015 is about 1259.3338662090. Note that the first 3 decimals are identical.

The spelling of 1997205015 in words is "one billion, nine hundred ninety-seven million, two hundred five thousand, fifteen".