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1999997 = 19105263
BaseRepresentation
bin111101000010001111101
310202121110222
413220101331
51002444442
6110511125
722666616
oct7502175
93677428
101999997
11114669a
128054a5
1355043c
143a0c0d
152978d2
hex1e847d

1999997 has 4 divisors (see below), whose sum is σ = 2105280. Its totient is φ = 1894716.

The previous prime is 1999993. The next prime is 2000003. The reversal of 1999997 is 7999991.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7999991 = 9678273.

It is a cyclic number.

It is not a de Polignac number, because 1999997 - 22 = 1999993 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999993) 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, 52613 + ... + 52650.

It is an arithmetic number, because the mean of its divisors is an integer number (526320).

21999997 is an apocalyptic number.

It is an amenable number.

1999997 is a deficient number, since it is larger than the sum of its proper divisors (105283).

1999997 is a wasteful number, since it uses less digits than its factorization.

1999997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105282.

The product of its digits is 413343, while the sum is 53.

The square root of 1999997 is about 1414.2125017125. The cubic root of 1999997 is about 125.9920419934.

The spelling of 1999997 in words is "one million, nine hundred ninety-nine thousand, nine hundred ninety-seven".

Divisors: 1 19 105263 1999997