1997197415 has 4 divisors (see below), whose sum is σ = 2396636904. Its totient is φ = 1597757928.

The previous prime is 1997197409. The next prime is 1997197429. The reversal of 1997197415 is 5147917991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1997197415 - 2⁸ = 1997197159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199719737 + ... + 199719746.

It is an arithmetic number, because the mean of its divisors is an integer number (599159226).

Almost surely, 2^1997197415 is an apocalyptic number.

1997197415 is a deficient number, since it is larger than the sum of its proper divisors (399439489).

1997197415 is an equidigital number, since it uses as much as digits as its factorization.

1997197415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399439488.

The product of its digits is 714420, while the sum is 53.

The square root of 1997197415 is about 44690.0147124612. The cubic root of 1997197415 is about 1259.3322688184.

The spelling of 1997197415 in words is "one billion, nine hundred ninety-seven million, one hundred ninety-seven thousand, four hundred fifteen".