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1285681396 = 22321420349
BaseRepresentation
bin100110010100001…
…1111000011110100
310022121020101022111
41030220133003310
510113113301041
6331324340404
743601053156
oct11450370364
93277211274
101285681396
115aa80850a
122ba6a4704
1317649382c
14c2a74ad6
1577d12981
hex4ca1f0f4

1285681396 has 6 divisors (see below), whose sum is σ = 2249942450. Its totient is φ = 642840696.

The previous prime is 1285681387. The next prime is 1285681399. The reversal of 1285681396 is 6931865821.

It can be written as a sum of positive squares in only one way, i.e., 681210000 + 604471396 = 26100^2 + 24586^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285681399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160710171 + ... + 160710178.

Almost surely, 21285681396 is an apocalyptic number.

It is an amenable number.

1285681396 is a deficient number, since it is larger than the sum of its proper divisors (964261054).

1285681396 is a wasteful number, since it uses less digits than its factorization.

1285681396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321420353 (or 321420351 counting only the distinct ones).

The product of its digits is 622080, while the sum is 49.

The square root of 1285681396 is about 35856.3996519450. The cubic root of 1285681396 is about 1087.3711008717.

The spelling of 1285681396 in words is "one billion, two hundred eighty-five million, six hundred eighty-one thousand, three hundred ninety-six".

Divisors: 1 2 4 321420349 642840698 1285681396