1997949 has 4 divisors (see below), whose sum is σ = 2663936. Its totient is φ = 1331964.

The previous prime is 1997939. The next prime is 1997969. The reversal of 1997949 is 9497991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1997949 - 2⁸ = 1997693 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1997898 and 1997907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332989 + ... + 332994.

It is an arithmetic number, because the mean of its divisors is an integer number (665984).

2^1997949 is an apocalyptic number.

It is an amenable number.

1997949 is a deficient number, since it is larger than the sum of its proper divisors (665987).

1997949 is an equidigital number, since it uses as much as digits as its factorization.

1997949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665986.

The product of its digits is 183708, while the sum is 48.

The square root of 1997949 is about 1413.4882383663. The cubic root of 1997949 is about 125.9490219577.

It can be divided in two parts, 199 and 7949, that multiplied together give a palindrome (1581851).

The spelling of 1997949 in words is "one million, nine hundred ninety-seven thousand, nine hundred forty-nine".