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1220997 = 31931691
BaseRepresentation
bin100101010000110000101
32022000220010
410222012011
5303032442
642100433
713243521
oct4520605
92260803
101220997
11764398
124aa719
133399ab
15191b9c
hex12a185

1220997 has 16 divisors (see below), whose sum is σ = 1771520. Its totient is φ = 745200.

The previous prime is 1220993. The next prime is 1221019. The reversal of 1220997 is 7990221.

It is not a de Polignac number, because 1220997 - 22 = 1220993 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1422 + ... + 2112.

It is an arithmetic number, because the mean of its divisors is an integer number (110720).

21220997 is an apocalyptic number.

It is an amenable number.

1220997 is a deficient number, since it is larger than the sum of its proper divisors (550523).

1220997 is a wasteful number, since it uses less digits than its factorization.

1220997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 1220997 is about 1104.9873302441. The cubic root of 1220997 is about 106.8820723065.

The spelling of 1220997 in words is "one million, two hundred twenty thousand, nine hundred ninety-seven".