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1399489 = 72134
BaseRepresentation
bin101010101101011000001
32122002201221
411111223001
5324240424
645555041
714616100
oct5255301
92562657
101399489
11876503
12575a81
133a0000
14286037
151c99e4
hex155ac1

1399489 has 15 divisors (see below), whose sum is σ = 1763637. Its totient is φ = 1107288.

The previous prime is 1399477. The next prime is 1399493. The reversal of 1399489 is 9849931.

The square root of 1399489 is 1183.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 2 ways, for example, as 693889 + 705600 = 833^2 + 840^2 .

It is not a de Polignac number, because 1399489 - 27 = 1399361 is a prime.

It is a super-2 number, since 2×13994892 = 3917138922242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1399439) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 107647 + ... + 107659.

21399489 is an apocalyptic number.

1399489 is the 1183-rd square number.

1399489 is the 592-nd centered octagonal number.

It is an amenable number.

1399489 is a deficient number, since it is larger than the sum of its proper divisors (364148).

1399489 is an frugal number, since it uses more digits than its factorization.

1399489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66 (or 20 counting only the distinct ones).

The product of its digits is 69984, while the sum is 43.

The cubic root of 1399489 is about 111.8552818364.

The spelling of 1399489 in words is "one million, three hundred ninety-nine thousand, four hundred eighty-nine".

Divisors: 1 7 13 49 91 169 637 1183 2197 8281 15379 28561 107653 199927 1399489